Probably a little late, but:
Usage: dolphin [/h] [/d] [/l] [/e <str>] [/b] [/V <str>] [/A <str>] [/m <str>] [/U <str>] [/P <str>]
/h, --help Show this help message
/d, --debugger Opens the debugger
/l, --logger Opens the logger
/e, --exec=<str> Loads the specified file (ELF, DOL, GCM, ISO, WBFS, CISO, GCZ, WAD)
/b, --batch Exit Dolphin with emulator
/V, --video_backend=<str> Specify a video backend
/A, --audio_emulation=<str> Low level (LLE) or high level (HLE) audio
/m, --movie=<str> Play a movie file
/U, --user=<str> User folder path
/P, --perf_dir=<str> Directory for Linux perf perf-$pid.map file
You need to use either the /e option or the --exec= option. You don't use the -- with /e. Also, include /b for batch mode. (Dolphin won't scan your iso directories, and it exits when you're done with that game.)
"C:\Files\Applications\Light Gun Games\Wii\Dolphin.exe" /b /e "C:\Files\Applications\Light Gun Games\Wii\Games\The House of The Dead 2 And 3 Returns.wbfs"
--Nexusmtz