Sony Ericsson Xperia X10 :: Videos Taken On Phone / Not Working With MediaGo?

I've taken several videos using my Xperia X10 (fantastic phone btw!). I can watch them back on my phone, however, when I open MediaGo, they are not on the "video clips" area but instead are in the "other files" area. Fine, however, when I try to play them, I get the following message "The file does not appear to be supported.

If you would like Media Go to attempt to play it, right click the file and choose re-scan". I do the "re-scan" but alas, am met with the same message when trying to play the video file? It seems strange that I captured the video on my x10, can play it on my x10, however, MediaGo for some reason doesn't support it?