Quote Originally Posted by Monsieur Alphonse
What is your operating system? XP or Vista? If it is Vista, everything is probably different.

For unpacking use the batch file: unpack name of campaign. After that the files should be in the data folder of the campaign (mods/campaign/data) and not in the data folder of vanilla.
I'm using Vista. And I did exactly what you described, but the unpacked files are nowhere to be found. They aren't in the mods/campaign/data folder, nor are they in the vanilla data folder.