What's up.
Sorry to be blunt, but since you ask, you're imagining solutions which are inappropriate and/or don't work, and apparently failing to properly try the suggestions that have been made.
You're right, exporting and re-importing is a hopelessly tedious and unnecessary solution. If you insist on going that route, however, the
Excel export/import routines work fine. There is no
XML import routine, so that's a non-starter.
I see no indication you considered either one of my alternate suggestions. I'm not sure, but it seems the
Replace Folders in File paths setting must have been provided for situations exactly like yours. Rescanning the drive should also work, assuming your file scanner configuration includes regex appropriate for your file pathnames.