diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
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+name: "Windows"
+on: [push]
+
+jobs:
+  test-windows-8_6_5:
+    name: "Win32 GHC-8.6.5"
+    runs-on: windows-latest
+    steps:
+      - name: Configure Chocolatey
+        run: choco source add -n mistuke -s https://www.myget.org/F/mistuke/api/v2
+      - name: Install msys2
+        run: choco install -y msys2
+      - name: Install GHC
+        run: choco install -y ghc --version 8.6.5
+      - name: Install Cabal
+        run: choco install -y cabal --version 3.0.0.0
+      - name: Set PATH
+        run: |
+          [Environment]::GetEnvironmentVariable("Path")
+          Write-Host "::add-path::C:\ProgramData\chocolatey\lib\cabal\tools\cabal-3.0.0.0"
+          Write-Host "::add-path::C:\ProgramData\chocolatey\lib\ghc\tools\ghc-8.6.5\bin"
+      - name: Print versions
+        run: |
+          ghc --version
+          cabal --version
+          cabal user-config init -a "http-transport: plain-http" -a "store-dir: C:\SR" -f -v3
+      - uses: actions/cache@v1
+        with:
+          path: C:\SR
+          key: cabal-store-8.6.5
+      - name: Update Hackage index
+        run: cabal v2-update
+      - uses: actions/checkout@v2
+
+      # Win32-network
+      - name: Build Win32-network dependencies
+        run: cabal v2-build -fdemo --only-dependencies Win32-network
+      - name: Build Win32-network
+        run: cabal v2-build -fdemo Win32-network
+
+      # io-sim-classes
+      - name: Build io-sim-classes dependencies
+        run: cabal v2-build -fasserts -fchecktvarinvariant --only-dependencies io-sim-classes
+      - name: Build io-sim-classes
+        run: cabal v2-build -fasserts -fchecktvarinvariant io-sim-classes
+
+      # io-sim
+      - name: Build io-sim dependencies
+        run: cabal v2-build -fasserts --only-dependencies io-sim
+      - name: Build io-sim
+        run: cabal v2-build -fasserts io-sim
+
+      # typed-protocols
+      - name: Build typed-protcols dependencies
+        run: cabal v2-build--only-dependencies typed-protocols
+      - name: Build typed-protocols
+        run: cabal v2-build typed-protocols
+
+      # typed-protocols-examples
+      - name: Build typed-protocols-examples dependencies
+        run: cabal v2-build --only-dependencies typed-protocols-examples
+      - name: Build typed-protocols
+        run: cabal v2-build typed-protocols-examples
+
+      # network-mux
+      - name: Build network-mux dependencies
+        run: cabal v2-build --only-dependencies -fasserts network-mux
+      - name: Build typed-protocols
+        run: cabal v2-build -fasserts network-mux
+
+      #
+      # Tests
+      #
+      # GitHub-Actions stop as soon as one of them fails; initially we want to
+      # just check if everything builds, test support will come later; then we
+      # can move this tests to each section (failing early is then a plus)
+      #
+
+      - name: Test Win32-network
+        run: cabal v2-run test-Win32-network
+      - name: Test io-sim
+        run: cabal v2-run -fasserts test-sim
+      - name: Test typed-protocols-examples
+        run: cabal v2-run typed-protocols-tests
+      - name: Test network-mux
+        run: cabal v2-run -fasserts test-network-mux