BIK
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BIK files are video or image files created using Bink, as part of RAD Video Tools. The startup video that plays on all Valve games (since the 
Source 2007 update) is a .bik file. They are also used in the menu backgrounds and the elevator screens in 
Portal 2
In all games using the 
Titanfall branch, the engine has been upgraded to use Bink 2.
In the 
CS:GO engine branch (since Panorama), as well as 
Strata Source, it's was replaced by WEBM.
Todo: Expand on this more