i tested on two files :)
you must have the license and be able to play the drm files.
undrm.zip and mp9dll.rar and wmp9 is what you need, not wmp10.
unzip undrm.zip to c:\drm , put yourdrmfile.wmv in c:\drm , put the .dlls from mp9dll.rar over the old versions of the dlls (usually c:\windows\system32), follow !!readme.txt instructions from undrm.zip.
