Hello,
If the mstsc.exe is missing or not working, I recommend trying the following steps:
- System File Checker Run command: sfc /scannow in an elevated Command Prompt (right-click on the Start button, select "Command Prompt (Admin)"). Allow the scan to complete and fix any detected issues.
- DISM In the same elevated Command Prompt, run the following command: dism /online /cleanup-image /restorehealth
Regards,
Karlie