As mentioned before, WMM will import AVI files, so for the best quality, you'll want to convert your video to AVI. As also previously mentioned, the quicktime to AVI codecs will give you terrible quality video. What I do is import the file into Adobe Premiere Elements 11 (other versions may work, but make sure it will import .mov files) on a Windows machine. Then simply share the video as an AVI. APE 11 is pretty fast so I'm assuming little or no re encoding is going on and the final AVI video looks great.
Transcoding* has to be done, since the AVI container/format cannot encapsulate video encoded with the ProRes codec - AVI is like a can and ProRes is the specific liquid inside that can - put an AVI can cannot hold ProRes and WMM cannot drink such stuff.
Thus the new AVI must use a new codec supported by WMM, which specific codec is supported by WMM I do not know, since WMM is not my cup of tea. And neither is iMovie.
And since this is an old topic, and AVI should be gone and no sane person should use WMM, I leave it at that.
* transcoding - the change of codec and often format, though the latter is not necessary, as converting a ProRes MOV to an H.264 MOV is transcoding without changing the format, only the change of codec