I tried opening just about every music sheet, and it always says it could not open because it was not a supported file type. What program must you have in order to open these files?
Help (http://www.ninsheetmusic.net/faq.php)
Look at the third question. you need Finale Notepad(found here (http://www.finalemusic.com/notepad/))
It's free and awesome.
dang beat me to it =P. u can also edit things and submit sheet's to this site too :P
I thanketh thee both.
De nada.