Explorer Replacement can't be turned on (or off) in Windows 7 anymore, since it doesn't work properly at the moment, so the setting must be left-over from a previous version of Opus. To remove the setting, follow this guide:
Explorer Replacement can't be turned on (or off) in Windows 7 anymore, since it doesn't work properly at the moment, so the setting must be left-over from a previous version of Opus. To remove the setting, follow this guide: