one question.... from the OP... did you copy this from a steam forum?
VAC Status: UNKNOWN (being looked into)
- The Valve Anti-Cheat system is enabled for servers displaying the Secured shield logo. Using custom skins, sounds or maps and playing multi-player mods which do not modify core .EXE and .DLL files will not result in a VAC ban (no matter what the SIZE OF THE IWI FILES ARE as long as game accepts them as valid)
please, provide the link...