I use 3 different file types, AVI, WMV and MOV. AVI is crisper, but file size can be large, making for a slow download.
WMV isn't quite so sharp, but the file sizes are smaller, which downloads quicker. MOV is a 'Quicktime' file type.
In other words, it's made to be played in Apple Computer's Quicktime Player. This can be downloaded from Apple.
NOTE: You can click the link to play the video, or right-click
on it and choose "Save Target As ..." to save it to your PC.
Windows Media Player Note: You can press Control-T to make it loop endlessly
Press Alt-Enter to make it full screen