I have been having trouble extracting the demo mod from its .rar file

I got an error #: 25116
Error: bad block

any idea if there is a way I can extract from this .rar to just get this .meg

I have tried it, I am using the program WinAce if it is of any Importance.

What file doesn't work? And where did you get the demo from?

The Demo is fine, this involves the Demo Mod. the Config.Meg I could not extract from the Mod of the Demo that came out that was going to add more buildings and units to the game. WinAce for some reason(as stated above) could not extract the config.meg from the mod. The Demo works well, this is about the installation of the mod for the demo.

If you get WINRAR, open it, then just drag and drop the new config file into the folder you need it to go in, that works. Thats what I did.

DMUK