Remote Desktop Connection is part of the OS, but you can reinstall it via :
: Obtain the version that matches your PC (Windows 64-bit, 32-bit, or ARM64) from the Microsoft Remote Desktop page. Run the Setup : reinstall remote desktop connection
Remote Desktop Connection (MSTSC) can be reinstalled on Windows 10/11 by downloading the appropriate 64-bit, 32-bit, or ARM64 installer from Microsoft. The process involves running the downloaded executable or using an elevated Command Prompt to restore the application. For full details, read the official guide at Microsoft learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/remotepc/uninstall-remote-desktop-connection. Microsoft Learn Remote Desktop Connection is part of the OS,
Often, the RDC client isn't "broken"—it is simply holding onto corrupted cached data. If the "Soft Reinstall" didn't work, clearing the registry entries for the client is the next logical step. For full details, read the official guide at Microsoft learn
If the app refuses to open at all, you can use PowerShell to force a re-registration of the Windows package. This is a command-line version of the reinstall process.