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you can use RDP Wrapper which acts as a middleman between Terminal Services and Service Control Manager. This way you don’t need to touch termsrv.dll file…
Download and extract RDPWrap-v1.6.zip (or newer), then run install.bat as admin. After installation is completed, run RDPConfig.exe. If all items under Diagnostics are green, you should be good to go.
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Multiple RDP (Remote Desktop) sessions in Windows 10