I had find the .desktop doing rpm -qlp mplayer-gui_2:1.0pre4-4_i386.rpm > install.list and look at the output... but thanks a lot! I knew which, whereis and find... but knew nothing about locate. What a great command! (Im new to linux... and I hate

the linux Search for files thingy, as you call it)
I downloaded the rpms direct from mplayer site and gmplayer.desktop was installed on /etc/X11/applnk/Multimedia. And the line "icon=..." was missing.
Change (or add) icons is just cosmetic... But i want to DELETE folders. I had 4 (four!!) duplicates Multimedia/mplayer + 4 Internet/Opera around my menus (some under such apropriate stuff as 'Server settings') Even if delete lauchers the folders, empty, stays on menus. And delete the folders on that path dont make it disapeare

.
Gnome is so simple and intuitive for the user why as one goes an inch under the surface it becames so wild, fragmented and contra-intuitive? I finally found the right folders at
/usr/share/gnome/apps/ and/or
(check it) /etc/X11/applnk/. If someone has the same problem, just (re)move them from that path.

(And don't forget to add the launchers of removed folders to /usr/share/applications)
Changes will only be made after you login again... and BE CAREFUL, my .ICEauthority file at my personal folder at home loose ownership and group to root (and make gnome session crash at start. check it before logout!!) good luck.
and thanks again, Jman, for your quick answers!
EDIT: I writed the wrong path to delete /Internet/Opera folder! Sorry, now is correct.