Here's Total Commander
http://www.ghisler.com/smartphone.htm
Download that and install on the phone. Once installed open up and keep hitting left arrow till you see \\Plugins at the top of the list. Go into Plugins, then registry\HKCU\ControlPanel\Sounds\ and delete the FileSizeLimit file or adjust it to a larger size. The address bar in Total Commander will show \\\registry\HKCU\ControlPanel\Sounds\ when your in the right spot.
Hope this helps.
Cheers,