From 6.0, the RDP file that Safeguard generates has SG- followed Asset Name and Account Name (e.g. SG-AssetName_AccountName). This title bar is shown when mstsc is not in full screen mode, or when hovering over the task bar.
Use a Microsoft utility to set a desktop background image with some identification to make it more easily identifiable in the Windows Taskbar preview screens and continue to use the built in MSTSC client:
NOTE: By default Safeguard connects with the "Detect connection quality automatically" option, in low bandwidth scenarios MSTSC will disable the background.
Another option could be to use Microsoft’s Remote Desktop Connection Manager, which allows the user to independently set the IP/hostname and the display name.
However, this would require having to copy the IP address or hostname, username connection string & password from the Safeguard client to Remote Desktop Connection Manager.