Warning, changing xfire_games.ini is not permanent and will revert back to default when xfire client updates itself. Make sure you save a portion of the ones you've changed and just copy and paste it again to the .ini file, do not try to overwrite the new .ini file by pasting the old .ini that you've save. Since xfire adds new game to the file. Not recommended.

Try this:
Open Notepad
Open C:\ProgramData\Xfire\xfire_games.ini
Search (Ctrl+F) for Lost Planet 2
Replace the entry there with the code below
Open the Games tab in Xfire's options, go to Not Installed, find Lost Planet 2, and manually detect it

Code:

[6303]
LongName=Lost Planet 2
ShortName=lp2
LauncherExe=Launcher.exe
DetectExe=LP2DX9.exe
Launch=%UA_LAUNCHER_EXE_PATH% %UA_LAUNCHER_EXTRA_ARGS% %UA_LAUNCHER_NETWORK_ARGS%
InGameRenderer=D3D9
InGameFlags=USE_PRESENT|ENABLE_MOUSE

Lord of the Rings Online (Directx10)
-Change or remove InGameRenderer[0][1][2] to IngameRenderer=D3D10
-Change InGameFlags[0][1][2] to InGameFlags..etc without the [0] or just remove 1 and 2.