» Mon May 14, 2012 5:38 am
You could but it wouldn't work.
Though the files will be present on your system, As far as Steam is concerned they won't be there. No registry entrys means that as far as your computer is concerned, it won't even know they're there either.
It won't be able to find them and will either try to download them from scratch, in which case you may as well download or it'll not work at all.