Try again to remove ILSpy.dll.config.

BuildTools/update-assemblyinfo.ps1

@@ -80,7 +80,6 @@ function gitBranch() {
 
 $templateFiles = (
     @{Input=$decompilerVersionInfoTemplateFile; Output="ICSharpCode.Decompiler/Properties/DecompilerVersionInfo.cs"},
-    @{Input="ILSpy/Properties/app.config.template"; Output = "ILSpy/app.config"},
     @{Input="ILSpy.AddIn/source.extension.vsixmanifest.template"; Output = "ILSpy.AddIn/source.extension.vsixmanifest"},
     @{Input="ILSpy.AddIn.VS2022/source.extension.vsixmanifest.template"; Output = "ILSpy.AddIn.VS2022/source.extension.vsixmanifest"},
     @{Input="ILSpy.Installer/AppPackage.cs.template"; Output = "ILSpy.Installer/AppPackage.cs"}

ILSpy.AddIn.VS2022/ILSpy.AddIn.VS2022.csproj

@@ -100,7 +100,7 @@
   <!-- END WORKAROUND -->
 
   <ItemGroup>
-    <Content Include="$(ILSpyBuildPath)*.dll;$(ILSpyBuildPath)ILSpy.exe;$(ILSpyBuildPath)ILSpy.dll.config;$(ILSpyBuildPath)*.json">
+    <Content Include="$(ILSpyBuildPath)*.dll;$(ILSpyBuildPath)ILSpy.exe;$(ILSpyBuildPath)*.json">
       <IncludeInVSIX>true</IncludeInVSIX>
       <VSIXSubPath>\ILSpy</VSIXSubPath>
     </Content>

ILSpy.AddIn/ILSpy.AddIn.csproj

@@ -106,7 +106,7 @@
   <!-- END WORKAROUND -->
 
   <ItemGroup>
-    <Content Include="$(ILSpyBuildPath)*.dll;$(ILSpyBuildPath)ILSpy.exe;$(ILSpyBuildPath)ILSpy.dll.config;$(ILSpyBuildPath)*.json">
+    <Content Include="$(ILSpyBuildPath)*.dll;$(ILSpyBuildPath)ILSpy.exe;$(ILSpyBuildPath)*.json">
       <IncludeInVSIX>true</IncludeInVSIX>
       <VSIXSubPath>\ILSpy</VSIXSubPath>
     </Content>