I saw that a lot of programs people put up, specifically cleaners, have to ask you for your Combat Arms directory. So to save a little user input you can just check this registry key:
for the folder path, like "C:\Nexon\Combat Arms". Or for CombatArms.exe:
Key Name: HKEY_LOCAL_MACHINE\SOFTWARE\Nexon\Combat Arms\Ver_US
Value Name: RootPath
for "C:\Nexon\Combat Arms\CombatArms.exe"
Value Name: Executable