After Uninstallation, I get Application Not Found dialog

[sab0]

When other applications try to open file explorer, or Firefox I click the file I downloaded, I get the following error dialog:

In Windows 11 settings under Default Apps, I clicked "Reset Default Apps" but it didn't help.

[Leo]

Please try the .reg file here to fix it;

How to manually remove Explorer Replacement settings

Turning off Explorer Replacement is usually done via one of two ways: If you want to keep Opus installed but don't want it to replace Explorer, go to Settings -> Preferences / Launching Opus / Explorer Replacement and set it to Don't replace Explo…

[sab0]

Running the Reg File from the FAQ fixed all my issues so far. Pretty sure I uninstalled Opus via the Windows Settings Applications screen, and not a Opus-specific uninstall.