Resolve Missing Files dialog won't go away

For years, I’ve lived with this dialog coming up on every project I open. I’m trying to clean up my process for future projects and cannot figure out how to get rid of this. I have read the HELP article, used the Locate button, used the Folder button, but in all cases it always comes back with a single .wav or .cpr file that it “can’t find.”

Both times it is referencing projects from years ago, so I’ve actually plugged in my external HD to point them in the right direction and find the correct files, but it still always comes back. Help!

https://www.steinberg.net/forums/viewtopic.php?f=226&t=99426&sid=62dc3bea52290dff827e0d0a43a2fe00