Very old Windows Media 100 files

I have a bunch of avi files from an old job that were created using the windows media 100 codec way back in 2000 or so. They're the only versions I have of some CG animation I did and I'd like to use them in my demo reel but I can't find anything that will play or convert them.
My employer owned the media 100 hardware/software and no longer exists. Any suggestions how I can convert these files to something I can use? I am on a windows PC and don't have access to a Mac.

Thanks