Nevermind, figured it out myself. It's FileDialog.AccessEnum.Filesystem
. There is a gotcha here, because that enum in GDScript is called just Access
, but in C# it's AccessEnum
. This is because the name Access
is already taken by a field in FileDialog
. If it weren't taken, the enum would be called just Access
. For example in Control
, the size flags are accessed as Control.SizeFlag.Fill
, etc..., and not Control.SizeFlagEnum.Fill
.
This should probably be mentioned in the docs.