Alright, that seemed to work for ARMA 2, but it's not working for Operation Arrowhead and Combined Operations.
Even after trying the same method with Operation Arrowhead,
When I try to launch Operation Arrowhead, I get an error message saying, "No entry 'bin\config.bin/CfgInGameUI/MPTable.shadow'.
When I try to launch Combined Operations, I don't even get an error message-- a black Java script box just pops up briefly and then disappears, and the game does not open.