add file in multiple projects without duplication

[John Boncek]

I have two projects within a VS 2017 solution and want to compile some files from one project in the other. I used Add Existing Item to add the files to the second project and it duplicated them on disk. Is there a way to do this so both projects reference the same copy of the file? The reason this is important is that the files are generated by external utilities and it will be a pain to copy them or allow them to get out of sync. Thanks for any pointers.

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