Viewer shows hex for all video

The info at the top of this FAQ about MPEG, AVI, MP3 and WAV ("may apply to WMV and WMA files as well") may fix the problem with WMV in the Movie plugin.

As for the MultiView plugin, it requires 3rd party viewer DLLs which Opus doesn't ship with. If you don't have the DLLs then it's of no use, but if you do have them (e.g. via Yahoo Desktop) then it's a bonus.

Opus doesn't ship with the MultiView DLLs because the company who makes them wanted to charge ridiculous royalties for them.