Hi Oldden,
To search for files (e.g. .rgt) on different PC drives, I use the free version of the "UltraSearch" program. (This works much faster and easier than with the internal Windows search function.)
Some users used to work with COPIES (of the same name) of .rgt files in different folders. The CoReF program can then help to keep all these copies (of the same registration files) up to date (If you change a Registration bank, the copies are not automatically updated.)
In the meantime, however, as I said, this is no longer necessary, because one Registration Bank can be used in any number of Playlists.
P.S.
External files are linked in many Registrations (e.g. User Styles, Multi Pads or MIDI files). While the Registration files (.rgt) can be moved anywhere, the files linked in the Registrations must remain in their original location and must not be renamed. While you can change the paths to the linked files in Murray Best's "Yamaha Registration Manager" if necessary (also in batch), this is not possible in "CoReF" as far as I know.
Best regards,
Chris