How to install/get Custom Maps for Team Fortress 2 with WinRar

How to install/get Custom Maps for Team Fortress 2 You must have WinRar or a rar extracting program to do this. Video made by {TRoLL}SlashingWolf http://steamcommunity.com/id/slashingwolf http://steamcommunity.com/groups/T__R_o_L__L