Sprawdz nastepujace klucze rejestru telefonu (jesli cos sie nie zgadza to popraw na te wartosci ktore Ci wyslalem):
[HKEY_CLASSES_ROOT\MP3File\Shell\Open\Command]
"Default" = "wmplayer.exe "%1""
[HKEY_CLASSES_ROOT\MP3File\Shellex\EventSoundHandlers\{245F94CF-DD9C-46F9-B4C8-D2B14A877893}]
"Default" = "XME EventSound Player"
[HKEY_CLASSES_ROOT\MP3File\DefaultIcon]
"Default" = "wmplayer.exe,-2001"
[HKEY_CLASSES_ROOT\MP3File]
"EditFlags" = dword : 00010000
"Default" = "MP3 Format Sound"
[HKEY_CLASSES_ROOT\.mp3]
"Default" = "MP3File"
Do edycji rejestru polecam CeRegEditor