To export from Final Cut to WMV, this can’t be done natively, you need to install a third-party app such as flip4mac (“Studio” or greater).
“When you do install something like flip4mac you will be able to export from FCP using quicktime conversion and choose the options for WMV” or can export a QuickTime (self-contained) and use a separate app (incl. QT Pro) to convert it [http://www.iov.co.uk/showarticle.pl?ft=0;id=61821;n=0]