[9999]
LongName=Starsiege
ShortName=starsiege
LauncherDirKey=HKEY_LOCAL_MACHINE\Software\Dynamix\Starsiege\Path
LauncherExe=Starsiege.exe
LauncherPasswordArgs=+password %UA_GAME_HOST_PASSWORD%
LauncherNetworkArgs=+connect %UA_GAME_HOST_NAME%:%UA_GAME_HOST_PORT% %UA_LAUNCHER_PASSWORD_ARGS%
Launch=%UA_LAUNCHER_EXE_PATH% %UA_LAUNCHER_EXTRA_ARGS% %UA_LAUNCHER_NETWORK_ARGS%
ServerStatusType=TRIBES
InGameRenderer=OGL
InGameFlags=USE_DINPUT1|ENABLE_MOUSE|USE_DINPUT_MOUSE
InGameOGLTextureOffset=32000


Copy the above code into xfire_games.ini.
The ID of 9999 should be unused, but in the event that it is then just change
it to something else that's not used.