I haven't done much editing yet, but here are the choices MainActor gives for adding media:
DV AVI multi file (*.dzl)
DV AVI Type 1 (*.avi)
DV AVI Type 2 (*.avi)
DV DIF (*.dif *.dv)
MJPEG (*.avi *.mjpg *.mjpeg)
MPEG Audio (*.mpa *.mpg *.mp2)
MPEG (*.mpg *.mpeg *.mmv *.mpv *.dat)
PNG
Static Image (plenty)
WAV
For wmv I guess you need additional codecs?
If you want to try it there's a free demo for Linux available at MainActor's homesite:
http://downloads.mainconcept.com/fdl...e_9.3.i686.rpm