A game on an exFAT drive will not start, and Valve says Proton cannot support it

T2Covered by 1 source · first reported by UploadVR / Road to VR / MIXED at 19 Oct, 12:41 UTC

A Steam game installed on an exFAT drive can refuse to start with nothing on screen to say why, and Valve has now given the reason in one sentence: "Proton currently can't support exFAT due to missing filesystem features." A Valve member wrote that on October 16, two and a half hours after the…