RBXGS
RBXGS (likely Roblox Game Server) was the predecessor to RCCService and managed rendering and game servers in the earlier days of Roblox (pre-2008). A dump of RBXGS server installers can be found at https://archive.org/details/rbxgssetup. It was an IIS plugin that used ATL for SOAP.
Installing on Windows Server 2003
 | Windows Server 2003 is an old operating system, and has not been in support since 2015. https://learn.microsoft.com/en-us/lifecycle/products/windows-server-2003-. It is recommended to firewall the virtual machine or make sure it cannot access any external resources. |
I recommend grabbing a Windows Server 2003 ISO from https://archive.org/details/WindowsServer2003. It contains a free 30 day license which should be good enough for prodding with it for a little bit. Of course, you can obtain a permanent key at a later date.
You need to install the Microsoft .NET Framework 2.0 (get it here https://www.microsoft.com/en-us/download/details.aspx?id=16614) in order for the installer to continue. It also requires Information Internet Services 4.0, which can be installed in Add or Remove Programs, then Add/Remove Windows Components, then pick Application Server, which should install IIS.
Then run the installer for RBXGS. By default, it will install to the RBXGS directory on the IIS web server.
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