I don't know if this was discussed before, but here i go:
I don´t really know why, but i had a plylist with some tunes already and I added the metalmadness.zip file, saved the playlist and it played just as fine. Then, i happenned to make a new playlist, and when i openned the first one,which had metal madness along some other tunes, and tryed to play some of the metal madness tunes xmplay croosed it with the red line, like when the file is unavailable, but everything was and is in place, where it should be!

I even openened the zip and tested it with winzip, but it said it has no errors.
I tryed making a separate new playlist for it, and the tunes worked again, but when i changed to some other playlist, and then back to the metal madness playlist, it did the red line thing again, and i had to start all over again.

This even happens when instead of opening a different playlist i reopen the metal madness playlist.
I think it might be an error in the zip plugin...
It would be good if it were fixed