If you own an old physical CD-ROM game (like Unreal Tournament 2004 or Prince of Persia: Sands of Time ):
Downloading DLLs from third-party sites can expose your computer to risks. Proceed with caution.
Since many games use Bink, you can sometimes find a working binkw32.dll in the folder of another game from the same era and copy it into the "broken" game's folder.