BIK

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 is replaced by WEBM.

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