<!-- More information on our issue management policies can be found here: https://aka.ms/aspnet/issue-policies ### Describe the bug I am seeing the same issue that was described here: https://www.gitmemory.com/issue/aspnet/Extensions/1333/507701113 II get a runtime exception constructing the `ManifestEmbeddedFileProvider` because it complains that the format of it's embedded manifest file is wrong - even though this is produced for me (i.e by the build task).  On looking around I came accross the above link and can confirm it only happens in the project on which I also am embedded a resx file i.e I have these additional csproj entries: ``` <ItemGroup> <Compile Update="Apps\PlatformSetup\Services\Resources\PlatformSeedData.Designer.cs"> <DesignTime>True</DesignTime> <AutoGen>True</AutoGen> <DependentUpon>PlatformSeedData.resx</DependentUpon> </Compile> </ItemGroup> <ItemGroup> <EmbeddedResource Update="Apps\PlatformSetup\Services\Resources\PlatformSeedData.resx"> <Generator>ResXFileCodeGenerator</Generator> <LastGenOutput>PlatformSeedData.Designer.cs</LastGenOutput> </EmbeddedResource> </ItemGroup> ``` ### To Reproduce Create a vanilla csproj project, include the `ManifestEmbeddedFileProvider` but also set up an embedded RESX file like so: ``` <ItemGroup> <Compile Update="Apps\PlatformSetup\Services\Resources\PlatformSeedData.Designer.cs"> <DesignTime>True</DesignTime> <AutoGen>True</AutoGen> <DependentUpon>PlatformSeedData.resx</DependentUpon> </Compile> </ItemGroup> <ItemGroup> <EmbeddedResource Update="Apps\PlatformSetup\Services\Resources\PlatformSeedData.resx"> <Generator>ResXFileCodeGenerator</Generator> <LastGenOutput>PlatformSeedData.Designer.cs</LastGenOutput> </EmbeddedResource> </ItemGroup> ``` Start your application and create an instance of the file provider. ### Exceptions (if any) As shown above. ### Further technical details - ASP.NET Core version: 3.1 - Include the output of `dotnet --info` - The IDE (VS / VS Code/ VS4Mac) you're running on, and its version
