Most of the commands are the same, but some require small differences that can be confusing to work out.
Almost all emulators just need:
<command>*PATH TO EMULATOR'S EXE* "%ROM_RAW%"</command>
But a few require different. I've listed them below.

Gamecube, same for Wii:
<command>*PATH TO DOLPHIN.EXE EMULATOR* /b /e "%ROM_RAW%"</command>
DS (This just makes it start Maximized rather than in a window. If you don't mind, follow the instructions at the top instead):
<command>start /max *PATH TO DESMUME.EXE* "%ROM_RAW%"</command>
N64:
<command>*PATH TO PROJECT64.EXE* %ROM%</command>