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1 year agoGIMP supports JPEG XL natively in 3.0 development versions. If I remember correctly GIMP 2.10 was released before JPEG-XL was ready, so I think that’s the reason. They could have added support in smaller update though, which was the case with AVIF.
It’s probably because you need to go to Steam settings and enable Proton for all games. I don’t understand why this is still not turned on by default…