When I attempt to add WinRAR to the listed of Shielded Apps, I am notified that WinRAR already exist in the list of Shielded Apps. WinRAR is not in the list of Shielded Apps. Also, I checked the WinRAR process with Process Explorer, and MBAE is not injecting into WinRAR.exe. I reported this several years ago, so I think this bug has been around for a long time. I would really like MBAE to protect WinRAR and other archive software. MBAE will allow me to add some child processes like RAR.exe, but not the parent process, WinRAR.exe.
Edition Windows 10 Pro