How to access the DLC content:
- Right-click on Halfquake Trilogy in your library, go to "Properties" > "DLC"
- Tick the checkbox to install, let Steam download it
- Right-click on Halfquake Trilogy again, select "Manage" > "Browse local files"
- You'll see a directory called "behind_the_death_scenes", which contains the behind-the-scenes files
All files retain their original names for authenticity.
(This was previously available on the Halfquake DVD.)
