SASAMI stands for "Specially Advanced Synchronized Accessible Media Interchange" and is a multimedia player with a very nice interface and good playback abilities - try it out for yourself. Note that for those with non English versions of Windows, you'll need to change your regional setting to English if you want to have English menus.
Please note that this is a general multimedia player for playing back AVI files. Different AVI files may be encoded with different "codecs" (compressors and decompressors ; COders and DECoders), so by having an AVI player, it doesn't mean you can play every single AVI file in the world (you'll need to separately download and install the codec for the AVI file as well). For more information on codecs, AVIs, and DivX in general, please refer to our DivX Help Page.