diff --git a/.build/compile.step b/.build/compile.step
index b99a2a7209..df0452e71d 100644
--- a/.build/compile.step
+++ b/.build/compile.step
@@ -21,7 +21,7 @@
   <property name="solution.path" value="${path::get-full-path(solution.path)}" />
   <property name="solution.path.windows.mono" value="${string::replace(dirs.current,'\','/')}/${string::replace(path_to_solution,'\','/')}/${project.name}.sln" />
   <property name="solution.path" value="${dirs.current}${path.separator}${path_to_solution}${path.separator}${project.name}.vbp" if="${microsoft.framework =='vb6'}" />
-  <property name="nant.settings.currentframework" value="mono-4.0" if="${platform::is-unix()}" overwrite="true" />
+  <property name="nant.settings.currentframework" value="mono-4.5" if="${platform::is-unix()}" overwrite="true" />
   <property name="nant.settings.currentframework" value="net-3.5" if="${microsoft.framework !='vb6' and platform::is-windows()}" overwrite="false" />
   <property name="framework.multitargeting" value="false" />
   <property name="framework.multitargeting.delimiter" value="," />
@@ -106,18 +106,18 @@
     <mkdir dir="${msbuild.outputpath}" />
     <if test="${platform::is-unix()}">
       <!-- Do clean and build in two steps since xbuild has a bug with using OutputPath and Rebuild together Bug #628525 at Novell -->
-      <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.0'}" />
+      <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.5'}" />
       <exec program="${app.xbuild}"
           basedir="/usr/bin"
           workingdir="${dirs.build}"
-          commandline="${solution.path} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.0'}" />
+          commandline="${solution.path} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.5'}" />
       <echo level="Warning" message="Building..." />
       <echo level="Warning" message="Working directory ${dirs.build}" />
       <echo level="Warning" message="Running ${app.xbuild} ${solution.path} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:detailed /toolsversion:${framework::get-version(microsoft.framework.specific)} /property:Platform='${msbuild.platform}' /property:TargetFrameworkVersion=v${framework::get-version(microsoft.framework.specific)} /l:${msbuild.logger};'${dirs.build_results}${path.separator}msbuild-${microsoft.framework.specific}-results.xml'" />
       <exec program="${app.xbuild}"
           basedir="/usr/bin"
           workingdir="${dirs.build}"
-          commandline="${solution.path} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:detailed /toolsversion:${framework::get-version(microsoft.framework.specific)} /property:Platform='${msbuild.platform}'  /property:TargetFrameworkProfile='' /property:TargetFrameworkVersion=v${framework::get-version(microsoft.framework.specific)} /l:${msbuild.logger};'${dirs.build_results}${path.separator}msbuild-${microsoft.framework.specific}-results.xml'" />
+          commandline="${solution.path} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:detailed /toolsversion:4.0 /property:Platform='${msbuild.platform}'  /property:TargetFrameworkProfile='' /property:TargetFrameworkVersion=v${framework::get-version(microsoft.framework.specific)} /l:${msbuild.logger};'${dirs.build_results}${path.separator}msbuild-${microsoft.framework.specific}-results.xml'" />
     </if>
     <if test="${platform::is-windows()}">
       <!-- nant is retarded - I had to have four of these instead of throwing an if on the outputpath and targets -->
@@ -125,11 +125,11 @@
         <if test="${framework.multitargeting}">
           <if test="${framework::get-family(microsoft.framework.specific) == 'mono'}" >
             <!-- Do clean and build in two steps since xbuild has a bug with using OutputPath and Rebuild together Bug #628525 at Novell -->
-            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.0'}" />
+            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.5'}" />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build.windows.mono}"
                 workingdir="${dirs.build.windows.mono}"
-                commandline="${solution.path.windows.mono} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.0'}" />
+                commandline="${solution.path.windows.mono} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.5'}" />
             <echo level="Warning" message='Building...by running this command ${app.xbuild} ${solution.path.windows.mono} /nologo /property:OutputPath="${msbuild.outputpath.windows.mono}" /property:Configuration=${msbuild.configuration} /verbosity:minimal' />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build.windows.mono}"
@@ -158,11 +158,11 @@
         <if test="${not framework.multitargeting}">
           <if test="${framework::get-family(microsoft.framework.specific) == 'mono'}" >
             <!-- Do clean and build in two steps since xbuild has a bug with using OutputPath and Rebuild together Bug #628525 at Novell -->
-            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.0'}" />
+            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.5'}" />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build.windows.mono}"
                 workingdir="${dirs.build.windows.mono}"
-                commandline="${solution.path.windows.mono} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.0'}" />
+                commandline="${solution.path.windows.mono} /nologo /property:OutputPath='${msbuild.outputpath}' /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.5'}" />
             <echo level="Warning" message='Building without multitargeting by running this command ${app.xbuild} ${solution.path.windows.mono} /nologo /property:OutputPath="${msbuild.outputpath.windows.mono}" /property:Configuration=${msbuild.configuration} /verbosity:minimal' />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build.windows.mono}"
@@ -191,11 +191,11 @@
         <if test="${framework.multitargeting}">
           <if test="${framework::get-family(microsoft.framework.specific) == 'mono'}" >
             <!-- Do clean and build in two steps since xbuild has a bug with using OutputPath and Rebuild together Bug #628525 at Novell -->
-            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.0'}" />
+            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.5'}" />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build}"
                 workingdir="${dirs.build}"
-                commandline="${solution.path} /nologo /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.0'}" />
+                commandline="${solution.path} /nologo /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.5'}" />
             <echo level="Warning" message="Building..." />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build}"
@@ -222,11 +222,11 @@
         <if test="${not framework.multitargeting}">
           <if test="${framework::get-family(microsoft.framework.specific) == 'mono'}" >
             <!-- Do clean and build in two steps since xbuild has a bug with using OutputPath and Rebuild together Bug #628525 at Novell -->
-            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.0'}" />
+            <echo level="Warning" message="Cleaning build..." if="${microsoft.framework.specific != 'mono-4.5'}" />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build.windows.mono}"
                 workingdir="${dirs.build.windows.mono}"
-                commandline="${solution.path.windows.mono} /nologo /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.0'}" />
+                commandline="${solution.path.windows.mono} /nologo /property:Configuration=${msbuild.configuration} /verbosity:minimal /noconsolelogger /target:Clean" if="${microsoft.framework.specific != 'mono-4.5'}" />
             <echo level="Warning" message="Building...by running this command ${app.xbuild} ${solution.path.windows.mono} /nologo /property:Configuration=${msbuild.configuration} /verbosity:minimal" />
             <exec program="${app.xbuild}"
                 basedir="${dirs.build.windows.mono}"
diff --git a/.build/default.build.settings b/.build/default.build.settings
index 2d2648519a..db137862e2 100644
--- a/.build/default.build.settings
+++ b/.build/default.build.settings
@@ -94,7 +94,7 @@
   <property name="fail.build.on.error" value="true" />
 
   <!-- FRAMEWORKS -->
-  <!-- microsoft.framework: vb6, net-1.0, net-1.1, net-2.0, net-3.5, net-4.0, net-4.5, netcf-1.0, netcf-2.0, silverlight-2.0, mono-1.0, mono-2.0, mono-3.5, mono-4.0, moonlight-2.0 (Enter multiple ones with a "," to take advantage of multitargeting) -->
+  <!-- microsoft.framework: vb6, net-1.0, net-1.1, net-2.0, net-3.5, net-4.0, net-4.5, netcf-1.0, netcf-2.0, silverlight-2.0, mono-1.0, mono-2.0, mono-3.5, mono-4.0, mono-4.5, moonlight-2.0 (Enter multiple ones with a "," to take advantage of multitargeting) -->
   <property name="microsoft.framework" value="net-4.0" overwrite="false" />
   <!-- language.short: vb,cs -->
   <property name="language.short" value="cs" overwrite="false" />
diff --git a/.travis.yml b/.travis.yml
index 2676361602..bf92067bca 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: csharp
 mono:
-  - 3.12.0
+  - 5.20.1
 install:
-  - sudo apt-get install mono-devel mono-gmcs
+  - sudo apt-get install mono-devel
   - nuget restore src/chocolatey.sln
 before_script:
   - chmod +x build.sh
diff --git a/README.md b/README.md
index 7baf606053..571dc55c5e 100644
--- a/README.md
+++ b/README.md
@@ -137,17 +137,24 @@ Running the build on Windows should produce an artifact that is tested and ready
 #### Other Platforms
 ##### Prerequisites:
 
- * Install and configure Mono 3.12.0 (3.8.0 should also work).
+ * Install and configure Mono 5.20.x (Other versions may work but have not been tested).
   * [Debian based](http://www.mono-project.com/docs/getting-started/install/linux/#debian-ubuntu-and-derivatives)
 
 ```sh
+# install prerequisites
+sudo apt install apt-transport-https dirmngr gnupg ca-certificates
 # add the key
+sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 
-sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
 # add the package repository
-echo "deb http://download.mono-project.com/repo/debian wheezy main" | sudo tee /etc/apt/sources.list.d/mono-xamarin.list
-# Ubuntu 12.10/12.04 - add this deb as well
-echo "deb http://download.mono-project.com/repo/debian wheezy-libtiff-compat main" | sudo tee -a /etc/apt/sources.list.d/mono-xamarin.list
+# Debian 10
+echo "deb https://download.mono-project.com/repo/debian stable-buster main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
+# Debian 9
+echo "deb https://download.mono-project.com/repo/debian stable-stretch main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
+# Ubuntu 18.04
+echo "deb https://download.mono-project.com/repo/ubuntu stable-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
+# Ubuntu 16.04
+echo "deb https://download.mono-project.com/repo/ubuntu stable-xenial main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
 
 # update package indexes
 sudo apt-get update
@@ -155,24 +162,54 @@ sudo apt-get update
 sudo apt-get install mono-devel -y
 ```
 
-  * [RPM Based](http://www.mono-project.com/docs/getting-started/install/linux/#centos-fedora-and-derivatives)
+  * [CentOS/RHEL](https://www.mono-project.com/download/stable/#download-lin-centos)
 
 ```sh
 ### NOT FULLY TESTED AND WORKING ###
-# add the EPEL
-sudo yum install epel-release -y
+# Switch to root shell
+su
+# Add the EPEL
+yum install epel-release -y
 # Add the key
-sudo rpm --import "http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF"
+pmkeys --import "http://pool.sks-keyservers.net/pks/lookup?op=get&search=0x3fa7e0328081bff6a14da29aa6a19b38d3d831ef"
 
 # Add the package repository
-sudo yum-config-manager --add-repo http://download.mono-project.com/repo/centos/
+# CentOS/RHEL 8
+su -c 'curl https://download.mono-project.com/repo/centos8-stable.repo | tee /etc/yum.repos.d/mono-centos8-stable.repo'
+# CentOS/RHEL 7
+su -c 'curl https://download.mono-project.com/repo/centos7-stable.repo | tee /etc/yum.repos.d/mono-centos7-stable.repo'
+# CentOS/RHEL 6
+rpm --import "http://pool.sks-keyservers.net/pks/lookup?op=get&search=0x3fa7e0328081bff6a14da29aa6a19b38d3d831ef"
 
-# update your system
-sudo yum update -y
+# Update your system
+yum update -y
 
 # Install mono-devel
-sudo yum install mono-devel -y
+yum install mono-devel -y
 
+```
+
+  * [Fedora](https://www.mono-project.com/download/stable/#download-lin-fedora)
+  
+```sh
+### NOT FULLY TESTED AND WORKING ###
+
+# Switch to root shell
+su
+# Add the key
+rpm --import "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF"
+
+# Add the package repository
+# Fedora 29
+su -c 'curl https://download.mono-project.com/repo/centos8-stable.repo | tee /etc/yum.repos.d/mono-centos8-stable.repo'
+# Fedora 28
+su -c 'curl https://download.mono-project.com/repo/centos7-stable.repo | tee /etc/yum.repos.d/mono-centos7-stable.repo'
+
+# Update
+dnf update
+
+# Install mono-devel
+dnf install mono-devel -y
 
 ```
 
diff --git a/build.sh b/build.sh
index 648b60c383..cd1b4a558a 100755
--- a/build.sh
+++ b/build.sh
@@ -25,7 +25,6 @@ displayUsage $1
 export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig:/Library/Frameworks/Mono.framework/Versions/Current/lib/pkgconfig:$PKG_CONFIG_PATH
 
 #mono ./lib/NAnt/NAnt.exe /logger:"NAnt.Core.DefaultLogger" /nologo /quiet /f:"$(cd $(dirname "$0"); pwd)/.build/default.build" /D:build.config.settings="$(cd $(dirname "$0"); pwd)/.uppercut" /D:microsoft.framework="mono-3.5" $*
-mono --runtime=v4.0.30319 ./lib/NAnt/NAnt.exe /logger:"NAnt.Core.DefaultLogger" /nologo /quiet /f:"$(cd $(dirname "$0"); pwd)/.build/default.build" /D:build.config.settings="$(cd $(dirname "$0"); pwd)/.uppercut" /D:microsoft.framework="mono-4.0" /D:run.ilmerge="false" /D:run.nuget="false" $*
-
-#/quiet /nologo /debug /verbose /t:"mono-4.0"
+mono --runtime=v4.0.30319 ./lib/NAnt/NAnt.exe /logger:"NAnt.Core.DefaultLogger" /nologo /quiet /f:"$(cd $(dirname "$0"); pwd)/.build/default.build" /D:build.config.settings="$(cd $(dirname "$0"); pwd)/.uppercut" /D:microsoft.framework="mono-4.5" /D:run.ilmerge="false" /D:run.nuget="false" $*
 
+#/quiet /nologo /debug /verbose /t:"mono-4.5"
\ No newline at end of file
diff --git a/docker/Dockerfile.linux b/docker/Dockerfile.linux
index 1dea04ead9..24754056ba 100644
--- a/docker/Dockerfile.linux
+++ b/docker/Dockerfile.linux
@@ -1,4 +1,4 @@
-FROM mono:3.12.1
+FROM mono:5.20.1.19
 
 MAINTAINER Justin Phelps <linuturk@onitato.com>
 
@@ -10,8 +10,10 @@ RUN chmod +x zip.sh
 RUN ./build.sh
 
 WORKDIR /usr/local/bin
-RUN ln -s /usr/local/src/choco/build_output/chocolatey
+RUN ln -s /usr/local/src/choco/code_drop/chocolatey
 
 COPY docker/choco_wrapper /usr/local/bin/choco
 
+ENV ChocolateyInstall /usr/local/bin/chocolatey
+
 WORKDIR /root
diff --git a/docker/choco_wrapper b/docker/choco_wrapper
index 3aa86b5e5c..745cdf43ce 100755
--- a/docker/choco_wrapper
+++ b/docker/choco_wrapper
@@ -1,3 +1,3 @@
 #!/bin/bash
 
-mono /usr/local/bin/chocolatey/choco.exe "$@" --allow-unofficial
+mono /usr/local/bin/chocolatey/console/choco.exe "$@" --allow-unofficial
diff --git a/lib/NAnt/NAnt.exe.config b/lib/NAnt/NAnt.exe.config
index d9542dd09c..ce2b284792 100644
--- a/lib/NAnt/NAnt.exe.config
+++ b/lib/NAnt/NAnt.exe.config
@@ -2497,6 +2497,166 @@
                         </task>
                     </tasks>
                 </framework>
+                <framework
+                    name="mono-4.5"
+                    family="mono"
+                    version="4.5"
+                    description="Mono 4.5 Profile"
+                    sdkdirectory="${toolDirectory}"
+                    frameworkdirectory="${toolDirectory}"
+                    frameworkassemblydirectory="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}"
+                    clrversion="4.0.30319"
+                    clrtype="Desktop"
+                    vendor="Mono"
+                    >
+                    <runtime>
+                        <probing-paths>
+                            <directory name="lib/mono/2.0" />
+                            <directory name="lib/mono/neutral" />
+                            <directory name="lib/common/2.0" />
+                            <directory name="lib/common/neutral" />
+                        </probing-paths>
+                        <modes>
+                            <auto>
+                                <engine program="${runtimeEngine}" />
+                                <environment>
+                                    <variable name="PATH" path="${path::combine(sdkInstallRoot, 'bin')};%PATH%" />
+                                    <variable name="MONO_CFG_DIR" path="${configDir};%MONO_CFG_DIR%" />
+                                </environment>
+                            </auto>
+                            <strict>
+                                <engine program="${runtimeEngine}">
+                                    <arg value="--runtime=v4.0.30319" />
+                                </engine>
+                                <environment>
+                                    <variable name="PATH" path="${path::combine(sdkInstallRoot, 'bin')};%PATH%" />
+                                    <variable name="MONO_CFG_DIR" path="${configDir};%MONO_CFG_DIR%" />
+                                </environment>
+                            </strict>
+                        </modes>
+                    </runtime>
+					<reference-assemblies basedir="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}">
+                        <include name="*.dll" />
+                   </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(frameworkAssemblyDirectory, 'mono/4.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(frameworkAssemblyDirectory, 'mono/3.5')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(frameworkAssemblyDirectory, 'mono/3.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(frameworkAssemblyDirectory, 'mono/2.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <task-assemblies>
+                        <!-- include Mono version-neutral assemblies -->
+                        <include name="extensions/mono/neutral/**/*.dll" />
+                        <!-- include Mono 2.0 specific assemblies -->
+                        <include name="extensions/mono/2.0/**/*.dll" />
+                        <!-- include .NET 2.0 specific assemblies -->
+                        <include name="extensions/common/2.0/**/*.dll" />
+                    </task-assemblies>
+                    <tool-paths>
+						            <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.5')}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/4.0')}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/3.5')}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/2.0')}" />
+                        <directory name="${path::combine(frameworkAssemblyDirectory, 'mono/1.0')}" />
+                        <!-- unmanaged tools -->
+                        <directory name="${sdkInstallRoot}/bin" />
+                    </tool-paths>
+                    <project>
+                        <!-- quick and dirty check to see if pkg-config is available (and configured) -->
+                        <property name="pkgconfig.available" value="${environment::variable-exists('PKG_CONFIG_PATH')}" />
+                        <if test="${pkgconfig.available}">
+                            <if test="${pkg-config::exists('mono')}">
+                                <call target="configure-from-pkg-config" />
+                            </if>
+                            <if test="${not pkg-config::exists('mono')}">
+                                <call target="configure-from-registry" />
+                            </if>
+                        </if>
+                        <if test="${not pkgconfig.available}">
+                            <call target="configure-from-registry" />
+                        </if>
+
+                        <property name="toolDirectory" value="${path::combine(frameworkAssemblyDirectory, 'mono/4.0')}" />
+                        <property name="runtimeEngine" value="${path::combine(sdkInstallRoot, 'bin/mono.exe')}" />
+
+                        <target name="configure-from-pkg-config">
+                            <property name="mono.version" value="${pkg-config::get-mod-version('mono')}" />
+                            <property name="sdkInstallRoot" value="${cygpath::get-windows-path(pkg-config::get-variable('mono', 'prefix'))}" />
+                            <property name="frameworkAssemblyDirectory" value="${cygpath::get-windows-path(pkg-config::get-variable('mono', 'libdir'))}" />
+                            <property name="configDir" value="${path::combine(sdkInstallRoot, 'etc')}/" />
+                        </target>
+
+                        <target name="configure-from-registry">
+                            <monoregistry property="mono.reg" failonerror="false" />
+                            <readregistry
+                                property="mono.version"
+                                key="${mono.reg}\DefaultCLR"
+                                hive="LocalMachine"
+                            />
+                            <property name="monokey" value="${mono.reg}\${mono.version}" />
+
+                            <readregistry
+                                property="sdkInstallRoot"
+                                key="${monokey}\SdkInstallRoot"
+                                hive="LocalMachine" />
+                            <readregistry
+                                property="frameworkAssemblyDirectory"
+                                key="${monokey}\FrameworkAssemblyDirectory"
+                                hive="LocalMachine" />
+                            <readregistry
+                                property="configDir"
+                                key="${monokey}\MonoConfigDir"
+                                hive="LocalMachine" />
+                        </target>
+                    </project>
+                    <properties>
+                    </properties>
+                    <tasks>
+                        <task name="al">
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="csc">
+                            <attribute name="exename">dmcs</attribute>
+                            <attribute name="managed">true</attribute>
+                            <attribute name="langversion">linq</attribute>
+                            <attribute name="supportspackagereferences">true</attribute>
+                            <attribute name="supportsnowarnlist">true</attribute>
+                            <attribute name="supportsdocgeneration">true</attribute>
+                            <attribute name="supportskeycontainer">true</attribute>
+                            <attribute name="supportskeyfile">true</attribute>
+                            <attribute name="supportsdelaysign">true</attribute>
+                            <attribute name="supportslangversion">true</attribute>
+                        </task>
+                        <task name="jsc">
+                            <attribute name="exename">mjs</attribute>
+                            <attribute name="managed">strict</attribute>
+                        </task>
+                        <task name="vbc">
+                            <attribute name="exename">vbnc</attribute>
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="resgen">
+                            <attribute name="managed">true</attribute>
+                            <attribute name="supportsexternalfilereferences">true</attribute>
+                        </task>
+                        <task name="delay-sign">
+                            <attribute name="exename">sn</attribute>
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="license">
+                            <attribute name="hascommandlinecompiler">false</attribute>
+                        </task>
+                        <task name="ilasm">
+                            <attribute name="managed">true</attribute>
+                        </task>
+                    </tasks>
+                </framework>
                 <framework
                     name="moonlight-2.0" 
                     family="moonlight"
@@ -3109,6 +3269,116 @@
                         </task>
                     </tasks>
                 </framework>
+                <framework
+                    name="mono-4.5"
+                    family="mono"
+                    version="4.5"
+                    description="Mono 4.5 Profile"
+                    sdkdirectory="${toolDirectory}"
+                    frameworkdirectory="${toolDirectory}"
+                    frameworkassemblydirectory="${path::combine(prefix, 'lib/mono/4.5')}"
+                    clrversion="4.0.30319"
+                    clrtype="Desktop"
+                    vendor="Mono"
+                    >
+                    <runtime>
+                        <probing-paths>
+                            <directory name="lib/mono/2.0" />
+                            <directory name="lib/mono/neutral" />
+                            <directory name="lib/common/2.0" />
+                            <directory name="lib/common/neutral" />
+                        </probing-paths>
+                        <modes>
+                            <auto>
+                                <engine program="${path::combine(prefix, 'bin/mono')}" />
+                            </auto>
+                            <strict>
+                                <engine program="${path::combine(prefix, 'bin/mono')}">
+                                    <arg value="--runtime=v4.0.30319" />
+                                </engine>
+                            </strict>
+                        </modes>
+                    </runtime>
+					<reference-assemblies basedir="${path::combine(prefix, 'lib/mono/4.5')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/4.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/3.5')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/3.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <reference-assemblies basedir="${path::combine(prefix, 'lib/mono/2.0')}">
+                        <include name="*.dll" />
+                    </reference-assemblies>
+                    <task-assemblies>
+                        <!-- include Mono version-neutral assemblies -->
+                        <include name="extensions/mono/neutral/**/*.dll" />
+                        <!-- include Mono 2.0 specific assemblies -->
+                        <include name="extensions/mono/2.0/**/*.dll" />
+                        <!-- include .NET 2.0 specific assemblies -->
+                        <include name="extensions/common/2.0/**/*.dll" />
+                    </task-assemblies>
+                    <tool-paths>
+                        <directory name="${toolDirectory}" />
+						 <directory name="${path::combine(prefix, 'lib/mono/4.5')}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/3.5')}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/2.0')}" />
+                        <directory name="${path::combine(prefix, 'lib/mono/1.0')}" />
+                        <!-- unmanaged tools -->
+                        <directory name="${prefix}/bin" />
+                    </tool-paths>
+                    <project>
+                        <if test="${not pkg-config::exists('mono')}">
+                            <fail>Unable to locate 'mono' module using pkg-config. Download the Mono development packages from http://www.mono-project.com/downloads/.</fail>
+                        </if>
+                        <property name="resgen.supportsexternalfilereferences" value="false" />
+                        <property name="prefix" value="${pkg-config::get-variable('mono', 'prefix')}" />
+                        <property name="toolDirectory" value="${path::combine(prefix, 'lib/mono/4.5')}" />
+                    </project>
+                    <tasks>
+                        <task name="al">
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="csc">
+                            <attribute name="exename">dmcs</attribute>
+                            <attribute name="managed">true</attribute>
+                            <attribute name="langversion">linq</attribute>
+                            <attribute name="supportspackagereferences">true</attribute>
+                            <attribute name="supportsnowarnlist">true</attribute>
+                            <attribute name="supportsdocgeneration">true</attribute>
+                            <attribute name="supportskeycontainer">true</attribute>
+                            <attribute name="supportskeyfile">true</attribute>
+                            <attribute name="supportsdelaysign">true</attribute>
+                            <attribute name="supportslangversion">true</attribute>
+                        </task>
+                        <task name="jsc">
+                            <attribute name="exename">mjs</attribute>
+                            <attribute name="managed">strict</attribute>
+                        </task>
+                        <task name="vbc">
+                            <attribute name="exename">vbnc</attribute>
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="resgen">
+                            <attribute name="managed">true</attribute>
+                            <attribute name="supportsexternalfilereferences">true</attribute>
+                        </task>
+                        <task name="delay-sign">
+                            <attribute name="exename">sn</attribute>
+                            <attribute name="managed">true</attribute>
+                        </task>
+                        <task name="license">
+                            <attribute name="hascommandlinecompiler">false</attribute>
+                        </task>
+                        <task name="ilasm">
+                            <attribute name="managed">true</attribute>
+                        </task>
+                    </tasks>
+                </framework>
                 <framework
                     name="moonlight-2.0" 
                     family="moonlight" 
diff --git a/src/chocolatey.tests/TinySpec.cs b/src/chocolatey.tests/TinySpec.cs
index 460cddcafe..9ccff1d130 100644
--- a/src/chocolatey.tests/TinySpec.cs
+++ b/src/chocolatey.tests/TinySpec.cs
@@ -147,18 +147,15 @@ public PendingAttribute(string reason)
         }
     }
 
-#if __MonoCS__
-     public class WindowsOnlyAttribute : IgnoreAttribute
+    public class WindowsOnlyAttribute : PlatformAttribute
     {
-        public WindowsOnlyAttribute() : base("This is a Windows only test")
+        public WindowsOnlyAttribute()
         {
+            Exclude = "Mono, Linux, MacOsX, Linux";
         }
+
+        public WindowsOnlyAttribute(string platforms): base(platforms)
     }
-#else
-    public class WindowsOnlyAttribute : Attribute
-    {
-    }
-#endif
 
     public class IntegrationAttribute : CategoryAttribute
     {
diff --git a/src/chocolatey.tests/infrastructure.app/services/RegistryServiceSpecs.cs b/src/chocolatey.tests/infrastructure.app/services/RegistryServiceSpecs.cs
index cf2d03e470..f2102d1dce 100644
--- a/src/chocolatey.tests/infrastructure.app/services/RegistryServiceSpecs.cs
+++ b/src/chocolatey.tests/infrastructure.app/services/RegistryServiceSpecs.cs
@@ -21,6 +21,7 @@ namespace chocolatey.tests.infrastructure.app.services
     using chocolatey.infrastructure.services;
     using Microsoft.Win32;
     using Moq;
+    using NUnit.Framework;
     using Should;
     using Registry = chocolatey.infrastructure.app.domain.Registry;
 
@@ -47,6 +48,7 @@ protected void reset()
         }
 
         [WindowsOnly]
+        [Platform(Exclude = "Mono")]
         public class when_RegistryService_get_installer_keys_is_called : RegistryServiceSpecsBase
         {
             private Registry _result;
@@ -69,6 +71,7 @@ public void should_not_be_null()
         }
 
         [WindowsOnly]
+        [Platform(Exclude = "Mono")]
         public class when_RegistryService_get_key_is_called_for_a_value_that_exists : RegistryServiceSpecsBase
         {
             private RegistryKey _result;
@@ -111,6 +114,7 @@ public void should_contain_values()
         }
 
         [WindowsOnly]
+        [Platform(Exclude = "Mono")]
         public class when_RegistryService_get_key_is_called_for_a_value_that_does_not_exist : RegistryServiceSpecsBase
         {
             private RegistryKey _result;
diff --git a/src/chocolatey.tests/infrastructure.app/services/TemplateServiceSpecs.cs b/src/chocolatey.tests/infrastructure.app/services/TemplateServiceSpecs.cs
index 364dd1bf10..fb9f9f9659 100644
--- a/src/chocolatey.tests/infrastructure.app/services/TemplateServiceSpecs.cs
+++ b/src/chocolatey.tests/infrastructure.app/services/TemplateServiceSpecs.cs
@@ -26,6 +26,7 @@ namespace chocolatey.tests.infrastructure.app.services
     using chocolatey.infrastructure.app.templates;
     using chocolatey.infrastructure.filesystem;
     using Moq;
+    using NUnit.Framework;
     using Should;
 
     public class TemplateServiceSpecs
@@ -373,6 +374,7 @@ public override void BeforeEachSpec()
 
             [Fact]
             [WindowsOnly]
+            [Platform(Exclude = "Mono")]
             public void should_generate_all_files_and_directories()
             {
                 because();
@@ -394,6 +396,7 @@ public void should_generate_all_files_and_directories()
 
             [Fact]
             [WindowsOnly]
+            [Platform(Exclude = "Mono")]
             public void should_generate_all_files_and_directories_even_with_outputdirectory()
             {
                 config.OutputDirectory = "c:\\packages";
diff --git a/zip.sh b/zip.sh
index 0828a3fd0c..564161cf6b 100755
--- a/zip.sh
+++ b/zip.sh
@@ -24,4 +24,4 @@ displayUsage $1
 export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig:/Library/Frameworks/Mono.framework/Versions/Current/lib/pkgconfig:$PKG_CONFIG_PATH
 
 #mono ./lib/NAnt/NAnt.exe /logger:"NAnt.Core.DefaultLogger" /nologo /quiet /f:"$(cd $(dirname "$0"); pwd)/.build/zip.build" /D:build.config.settings="$(cd $(dirname "$0"); pwd)/.uppercut" /D:microsoft.framework="mono-3.5" $*
-mono --runtime=v4.0.30319 ./lib/NAnt/NAnt.exe /logger:"NAnt.Core.DefaultLogger" /nologo /quiet /f:"$(cd $(dirname "$0"); pwd)/.build/zip.build" /D:build.config.settings="$(cd $(dirname "$0"); pwd)/.uppercut" /D:microsoft.framework="mono-4.0" $*
+mono --runtime=v4.0.30319 ./lib/NAnt/NAnt.exe /logger:"NAnt.Core.DefaultLogger" /nologo /quiet /f:"$(cd $(dirname "$0"); pwd)/.build/zip.build" /D:build.config.settings="$(cd $(dirname "$0"); pwd)/.uppercut" /D:microsoft.framework="mono-4.5" $*