https://bugs.winehq.org/show_bug.cgi?id=54243
--- Comment #3 from Rafał Mużyło galtgendo@o2.pl --- Actually, as long as the vhba_ctl gets marked by udev as user accessible (which the ebuild does set up), the virtual device gets treated as any other cd drive by any standard desktop automount system. As such, things like cd swapping tend to work as intended.
Mounting an iso is little different than just coping cdrom content onto your drive (read-only filesystem aside).
While there might be some cdrom checks that check filesystem type (DRM is retarded, news at 11), most tend to go more in the direction 'is this a cdrom drive ?'.
My point is that while it's a regression from 'things stopped working' angle, it also might be a more correct handling. If the check needs more than setting the drive type to cdrom in winecfg, that's quite likely.