@open-flankler the way this typically works, the permissions “inherit” from their parents all the way up to the root of the drive
it’s a persistent problem with Windows and secondary drives – it greatly depends on where that drive came from … another computer … or leftover from a previous Windows install … or newly formatted, etc
anyway, pay attention to permissions on the root D:\ folder and the top-level folders for any other games or other stuff you have on that drive
try to make it match what’s on C:\ …
(but if you see stuff about “Mandatory High Label” don’t worry too much about that … that’s just something to help protect the root OS drive)