A Museum won't play -_-"
 

Okie...I DLed part1 700meg file and it won't play, the other .avi works perfectly on WMP for me besides this one, part 2 plays perfectly.

VLC doesn't make it play either, any suggestions besides redownloading a 700meg file?

try Media Player Classic, if that doesn't play it, nothing else will. Unless of course you need a codec. To download, google it ^^.

...Still doesn't play -_-' Any idea what codec I might be needing?

if it's an avi wouldn't it work with Quicktime?

You should try installing the DefilerPak and see how it goes from there

Try running DivFix on the file: browse to the file, then click "Rebuild Index".
Alternatively, get whoever you downloaded the file from to post you a working copy of the file on a DVD, which could also contain all sorts of other lovely Ayu files :)