Extract the left 4 dead demo files.
GCFScape v1.7.1 NOW HAS .VPK COMPATIBLITY! DOWNLOAD NOW
OLD WAY This tutorial will teach you how to open and extract the encrypted .vpk file in the left 4 dead demo.
1) Go here http://blog.gib.me/2008/11/14/left4dead-vpk-extraction-tools-now-with-ui/ and download the Left4Dead *.vpk Extraction Tools.
Extract the .zip and you should get this:

2) Now, run the .exe. Click extract and open the .vpk file in C:\Program Files\Steam\steamapps\common\left 4 dead demo\left4dead. Select a folder to extract all the files in and wait.
And, you're done! Happy modding!
If you want to import all this stuff to Gmod, then read the following tutorials:












