Yea, i have mplayer installed. I can execute the test.mp3 file I have by entering mplayer /(path to file)/test.mp3

I don't know if something happened to my N800 or what, but I have gotten different results from typing in the same exact commands. Either not found or permission denied.

For the permission denied message I may be able to run chmod +x abplayer on my laptop and then copy the file over to my tablet. The file is definitely there, so I don't know why I get the not found message.

Have you tried to run the abplayer file and get it to work? If so, can you post you exact procedure, step by step, so I can delete the file and try again?