I don't think there is a free way to convert .mov to .wmv since MS owns the rights to .wmv and likes to keep it in check.
The Flip4Mac people have a convertor, but it's not free. The free version of F4M does not allow exporting to .wmv
Not sure about Perian though, but it is designed to view different formats and not save them.
Sorry it's not much help. Get the PC people to install qt and you have it made.
I have QTPro 7.5.5 (249.13) with fully updated Leopard on an iMac 24, 2.4Ghz, 4G memory.
Trying to convert a .mov file to .wmv using either flip4mac or perian or any other plugin. In any configuration QT crashes no matter what conversion type I'm using. A little rectangular white window appears with only the orange dot visible and within seconds I get the beach ball running and have to Force Quit QT. Looked all over the internet to no avail - except lots of complaints regarding conversion in QT with no real solutions being offered. Emptied cash and trashed prefs file all to no avail. Is this a QT bug in 7.5.5 although I haven't heard anything on the Apple site?
Any suggestions or comments or others with the same issue?