most avi files on net are xvid,divx,h263 compressed, those sure will play. if u have files already and u want to check what compression was used, install MediaInfo Lite on you pc, right click on the file and you will see what compression is used. extention(like .avi,mp4.mkv) are just containers. its possible to have an .AVI file but has h264 compression so it will not play on your player. explore lang and ask around. we will help as much as we can(but not talking about P stuffs kay maka piso ta sa mods)