diff --git a/scripts/installer_win/surge-x86.iss b/scripts/installer_win/surge-x86.iss
index f1885548120..c4f16966f44 100644
--- a/scripts/installer_win/surge-x86.iss
+++ b/scripts/installer_win/surge-x86.iss
@@ -55,7 +55,7 @@ Name: EffectsSA; Description: Surge XT Effects Standalone (32-bit); Types: full
 Name: Data; Description: Data Files; Types: full compact custom; Flags: fixed
 
 [Files]
-Source: {#SURGE_SRC}\resources\data\*; DestDir: {commonappdata}\Surge XT\; Components: Data; Flags: recursesubdirs; Excludes: "*.git,windows.wt,configuration.xml,paramdocumentation.xml";
+Source: {#SURGE_SRC}\resources\data\*; DestDir: {commonappdata}\Surge XT\; Components: Data; Flags: recursesubdirs; Attribs: readonly; Excludes: "*.git,windows.wt,configuration.xml,paramdocumentation.xml";
 
 ;; these lines are used by Azure pipelines - if you want to build the installer locally, comment them out!
 Source: {#SURGE_BIN}\surge_xt_products\Surge XT (32-bit).vst3\*; DestDir: {commoncf32}\VST3\Surge Synth Team\; Components: VST3; Flags: ignoreversion recursesubdirs
diff --git a/scripts/installer_win/surge.iss b/scripts/installer_win/surge.iss
index 7059ae60a2b..0e16d11ae9e 100644
--- a/scripts/installer_win/surge.iss
+++ b/scripts/installer_win/surge.iss
@@ -57,7 +57,7 @@ Name: EffectsSA; Description: Surge XT Effects Standalone (64-bit); Types: full
 Name: Data; Description: Data Files; Types: full compact custom; Flags: fixed
 
 [Files]
-Source: {#SURGE_SRC}\resources\data\*; DestDir: {commonappdata}\Surge XT\; Components: Data; Flags: recursesubdirs; Excludes: "*.git,windows.wt,configuration.xml,paramdocumentation.xml";
+Source: {#SURGE_SRC}\resources\data\*; DestDir: {commonappdata}\Surge XT\; Components: Data; Flags: recursesubdirs; Attribs: readonly; Excludes: "*.git,windows.wt,configuration.xml,paramdocumentation.xml";
 Source: {#SURGE_BIN}\surge_xt_products\Surge XT.vst3\*; DestDir: {commoncf64}\VST3\Surge Synth Team\; Components: VST3; Flags: ignoreversion recursesubdirs
 Source: {#SURGE_BIN}\surge_xt_products\Surge XT Effects.vst3\*; DestDir: {commoncf64}\VST3\Surge Synth Team\; Components: EffectsVST3; Flags: ignoreversion skipifsourcedoesntexist recursesubdirs
 Source: {#SURGE_BIN}\surge_xt_products\Surge XT.exe; DestDir: {commonpf64}\Surge Synth Team\; Components: SA; Flags: ignoreversion