I see a few things interesting.
Your post implies the one on the right doesn't work, right?

It has specific data in the bottom fields under Acid Information that the left file doesn't have.

Another thing I notice is the file path in the left file contains a period in a folder path; I could see this wreaking havoc in some scenarios. The dot usually occurs before the file extension, not in a folder name. But if I read your post right, you say that one does work and the other one in the RealTracks\Loops folder doesn't?

FWIW, loops stopped working for me altogether recently in RB, so I can't really test anything to help.
Just noticing what you posted.

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