Someone once mentioned in the comments that there was some free plugin or add-on for Macs that would allow them to view streaming WMV video files, which is a Windows format that's not playable on a stock Mac.
Similarly, a stock Windows machine can't play the Apple streaming format, Quicktime. Two decades on and these two behemoths never have resolved the issue.
Result? Adobe stepped in with its cross-platform Flash format and today both Quicktime and WMV have been relegated to the dust bin of history.
You snooze, you lose.
There are, however, still a bunch of excellent WMV vids out there, so if anyone has the answer to this ancient riddle, please let me know in the comments. I'll then do a fresh post with your name in lights (unless you decline because of shyness or fear of how it might be interpreted if it shows up on your résumé) and we'll have others download & test it, just to make sure it's OS-friendly.
If you're looking for test clips, all of the vids in the Bag O' Clips area of my Art Gallery are in WMV format due to quality issues. Pound for pound, bitrate for bandwidth, WMV is much better than the Flash format, FLV. All the rest of the site's clips are in FLV format, but I wanted to keep that area special.
T'anks for any help.