I was installing Gears of War for Windows that I got as a gift. While the installation process, the setup showed that it installing several file with the extension .comp

for example: Ending.bik.comp.

Now I know that the bik extension is used for Bink and Smacker. So I was a little surprised as to how to play these files(you know just to see the movies separately). However, just after copying these files, the setup started "decompressing" them. And pretty soon enough all the .comp extensions were gone. Now, I want to know what these .comp extensions were. Also, what compression technique did it use and which software allows this compression