I wonder if there's anyone here on the BBS who is experienced enough with the file format of WMA files who'd be willing to contact you privately to examine portions of the files in question to see what it was about them that made Emplode choke.

It would still be interesting to know if Jemplode rejects the files the same way that emplode does. I know Jemplode doesn't work with USB, but if you can manage to get an ethernet connection working, that might be a solution for you. I think ethernet connection to the Central would also mean faster file transfer times, so that's something to consider as well.