(stream) file association for win32 commandline mplayer

hi,

if anyone has the method to force WINDOWS and FIREFOX (not the same
method of course) to use MPLAYER commandline ???

for WINDOWS i have tried this batch, it works well for
non-stream files as ogg but not for m3u :-(

******************* go.bat
assoc .ogg=ztest1
assoc .m3u=ztest1
ftype ztest1="e:\mplayer2\mplayer.exe" "%%1"
******************



thanks of your answer(s) ;)