OK, getting somewhere, I used the excellent DMS Tool (and I'd be glad to make a donation!) to fix the DMS. Only fixing the PHTSYS, it worked again, even AAC files (re previous question).
However, in the keg, the previous excellent functionality of browsing both playlists, artists, albums, and genres was gone...
To get further, I have now tried to repair the full DMS, including formatting of the PHTDTA, and asking it to flash the firmware. But, it has now been running formatting of the PHTDTA (this is a 120 GB) partition for almost an hour...
Is this normal, or am I running into the issue of not having XP being able to format anything larger than 40 GB?
Cheers,
Hilde