Hi, Dave -
I don't know how you have the wmv files on your iPad, but if you are getting them through e-mails, try the free app "yxplayer2 lite."
I have a girlfriend who always sends me cute videos and the majority of them are wmv files. I used to have to wait until I could access them via my PC - then I stumbled across this app. So far, it's played every wmv she's sent me.
One the app is installed, you just press on and hold the file in your e-mail until the little pop-up appears asking with which file you want to open the wmv. Select yxplayer lite and it'll open and you are watching wmv files!
Two caveats here: One, I've not tried this app on anything but e-mailed attachments and two, you do see ads at the bottom of the viewing screen. For me, if this continues to work, I'll buy the full version (which'll both get rid of the ads and thank the developer for it...).
Hope this helps.
Marilyn