1. Extract SC2Folder\Campaigns\Liberty.SC2Campaign\Base.SC2Maps to a folder of your choice
2. Open up the Mapeditor that comes with SC2 and create a new map and save it as template.SC2map - then close the Editor
foreach Map 3.
3.1. Create a folder with the according map name e.g. TRaynor01
3.2. Copy and paste the template.SC2Map file in there
3.3. Open the template.SC2Map with the MPQ Editor
3.4. Go to the folder where you extracted the files of Base.SC2Maps - in my case: D:\Games\StarCraft II\Maps\Campaign\TRaynor01.SC2Map\
3.5. Drag and drop the files from the folder in the MPQ Editor
3.6. Close MPQ Editor - rename the template.SC2Map to the map name - in this case TRaynor01.SC2Map
Enjoy playing campaign, although this is quite a hacky way, you can do it.
StarCraft 2 Wings of Liberty Torrent - RELOADED