Steam works again in ReactOS!
1) Used from Windows Server 2003, Mesa3D for renderer and to make it work. Audio is behind game itself regardless. Mouse issues are same as on Steam’s Proton with this game. Steam will stop running on Windows 2003 in 0 days.
2) That’s because it’s a patched Steam build to not auto-update. Check the link in description, it says same thing on XP and Server 2003. As for why it says Server 2003 - it’s because ReactOS reports itself as NT 5.2 which is equilevant to Server 2003. Next versions of Steam no longer support NT 5.1, 5.2 or 6.0.
3) It is done in a virtual machine, machine isn’t exactly the most resourceful for this Mesa3D is software renderer. Originally recorded this in 720p60 and it was completely unplayable, so settled for 720p30. VirtualBox’s own OGL renderer throws a BSoD with GTA 3.