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VisualStudio IntelliSense/Resharper C++ doesn’t work for .mm files

I’ve been working on a C++ file with the extension .mm. VisualStudio 2019’s IntelliSense wasn’t working, so I installed Resharper C++, but it was still not giving me any code completion or other features. However, when I renamed the file to have the .cpp extension it worked. Is there no way to tell Visual Studio or Reharper C++ to treat either all .mm files (or just a specific file) as C++ files?

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