Me and VŌŁØX!TY worked on it and we finaly find somehting that work in the xfire window and in the profile. The in-game chat also work in SP and VERUS. The Join button also work!

Heres how it goes :

1st: in ur .ini files, erase everything about SC:CT (beta, SPdemo)

2nd: put all that script under everything

[4424]
LongName=Splinter Cell Chaos Theory Single Player
ShortName=scctspd
Icon=scctspd.ico
LauncherDirKey=HKEY_LOCAL_MACHINE\SOFTWARE\Ubisoft \Tom Clancy's Splinter Cell Chaos Theory\InstallDir
LauncherDirAppend=\system
LauncherExe=Splintercell3.exe
Launch=%UA_LAUNCHER_EXE_PATH% %UA_LAUNCHER_NETWORK_ARGS%
CanBeUpForGame=FALSE
InGameRenderer=D3D9


[4425]
LongName=Splinter Cell Chaos Theory Multiplayer
ShortName=scctv
Icon=scctvb.ico
LauncherDirKey=HKEY_LOCAL_MACHINE\SOFTWARE\Ubisoft \Tom Clancy's Splinter Cell Chaos Theory\InstallDir
LauncherDirAppend=\versus\system
LauncherExe=SCCT_Versus.ex
LauncherNetworkArgs=-connect %UA_GAME_HOST_NAME%:%UA_GAME_HOST_PORT% %UA_LAUNCHER_PASSWORD_ARGS%
Launch=%UA_LAUNCHER_EXE_PATH% %UA_LAUNCHER_NETWORK_ARGS%
CanBeUpForGame=TRUE
InGameRenderer=D3D8


Enjoy =)