I have Windows 10 and Opus ver 12.3. When I set the opus to replace windows explorer through this option:"Preferences / Launching Opus / Explorer Replacement / Replace Explorer for all file system folders (recommended)", I end up unable to open control panel using run dialog and typing "control". The error is:"
There was a problem sending the command to the program.
But when I change to "Preferences / Launching Opus / Explorer Replacement / Don't replace Explorer", I can open control panel.
I found this same issue.
I do have a v10 (yeah, that's old) and get this error when I launch "System" with the Win+X menu in Win10. If I normally launch system it works nice.
Never used this Win+x menu before so I found this issue just now.
The call that is being intercepted is "%windir%\system32\control.exe /name Microsoft.System".
When I change to "Preferences / Launching Opus / Explorer Replacement / Don't replace Explorer", I can open system, but if I add Control panel to exceptions it does not work.
Also happening with power options ("%windir%\system32\control.exe /name Microsoft.PowerOptions") and with Programs and Features ("%windir%\system32\control.exe /name Microsoft.ProgramsAndFeatures").
Windows has changed a lot over the years, and the way Explorer Replacement is done had to be changed.
Opus 10 predates Windows 10 by several years. You'll need to upgrade to a more recent version of Opus if you want everything to work perfectly with the most recent version of Windows.