It seems VLC will now play these files. I am using VLC 1.0.5 on OSX 10.6. It will not play them in QuickTime even though I have Perian installed. You are probably trying to play them on Windows or Linux, but if it is working in OSX, it is probably working in the others as well.
As a side note, I convert them to a more friendly file format with iSquint. It takes the 104MB avi file and gives me a 3MB mp4 file of comparable quality! Compare that to the 12MB flash (terrible quality) and the 67MB Raster file (does anyone use this format?). It would be nice if TecPlot offered more choices for file formats that are more keynote/powerpoint friendly. I don't mind the few seconds of re-encoding on a different machine though.