Topic on Talk:ARK: Survival Evolved
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This version is from 11:41, 17 March 2020.
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Pretty sure, I tested a couple months ago and don't remember finding a way to enable it. I will redownload and test it again.
EDIT: Just downloaded the game, and the game refuses to go into exclusive fullscreen mode, so I cannot test it unfortunately. Looking through the config files saw no mention of HDR though, so I doubt it actually has support.