Hi this is probably a really dumb question but, how do you run the campagins? I know how to run replays and anything else like that but I cannot figure out how to run campagins. I get the .zip file and then I extract it. When I click run application it doesn't let me. I even tried to change the security settings. THinking that The Campaign had to be in the Starcraft program files (Like the replays) I eperimented and placed the file into Maps/campaign (you know the spce pirate maps or whatever) needless to say this really didn't work out too well. Sorry if this is posted somewhere on the site. I looked but couldn't find anything.
Potentially an older campaign that hasn't been updated for a newer sc version. Like Lav said your going to need to tell us the campaign your trying to run.
Are you using XP or Vista? It is possible that the file got corrupted during download. Make sure you have the most recent version of brood war as well. I know its a big file but if all else fails you can try re-downloading it, or try the lite version as opposed to the full (or vise versa).