Yes, add files to a project and mark as excluded.

>Okay, I apparently need to refine. With 'include' I refer to 'add to the project file and set it as included' what will result in an inclusion in the resulting app or exe. I assume that your advice here is to indeed add it to the project file, but set it as excluded, so it will not be included in the resulting app or exe.
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>Thanks for the reassurance.
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>>It's usefully to included header files into a project for reference. There is no point to include them in an EXE.