F5 did not (does not?) refresh playlist paths.
Yes, Notepad++ could easily do a search and replace, but I have about 90 playlists. You seem to be implying that NP++ can do all 90 at once? I've not come across batch editing, but this would've been helpful.
Hmmm ... I now see the option in the Find/Replace window to "Replace All in All Opened Documents." Next time I'll remember that it exists. Although I still think it would be easier if it was a MB function.
Thanks for pointing this out.