Content-Type: video/x-ms-wmv displays as giant blocks of text. How do I
display the video?
If you are seeing the raw MIME, then something is interfering with Outlook's
reception of the message. Usually it's caused by scanning mail with an
antivirus scanner. Uninstall your AV program and reinstall it without the
mail scanning feature.
While that may fix the MIME decoding problem, Outlook should not allow active
content in messages. I don't think you'll be able to see movies embedded in a
message. Give it a try, though.