DVD with usb wn8202d

i have dvd player china which contains sunplus SPHE8202D Universal Decocoder board(as written on manual) however the model written on circuit card is wn8202D, tthis DVD has USB Function as well. can any will tell me what type of Songs can we run through USB, i have insert different video files with various extensions but it does not even show the files, while it shows and plays MP3 Audio files, and JPEG image files, any know abt this model of DVD, or ciruit card.