From the Desktop

The options here let you launch Opus or run another command by double-clicking on the Windows desktop. This can provide an extremely quick way to access a Lister when you have no windows currently open - simply find an empty area of the desktop (one with no icons on it) and double-click.

• Disable: Select this to disable double-click on the desktop.

• Bring the last active Lister to the front: If there are one or more Listers already open, a double-click on the desktop will bring to the front the one you used most recently. If no Listers are open a new one is opened using the Default Lister settings. If you are using Windows 10's virtual desktops feature, only windows on the currently active desktop will be considered, unless you turn off the advanced Advanced setting.

• Open the Default Lister: Opens a new Lister using the settings for the Default Lister.

• Open a saved Lister layout: Opens a saved Lister layout. If you turn on the Close existing Listers option then any existing Listers will be closed before opening the layout - if this is off, existing Listers will be unaffected.

• Run a command: Lets you enter a command to be run whenever the desktop is double-clicked. This can be used to perform more complex actions including running external programs. This must be a command that would make sense on a button or hotkey. You can use Opus internal commands or external programs (passing arguments to them using the standard control codes). If you want to run more than a simple single-line command, you can create a more complicated user-defined command and then specify the name of the user command here.

DOpusRT

When any of the double-click options are enabled, Opus launches a small helper application called DOpusRT.exe that runs continuously in the background. This is added to the registry to run automatically on startup, and means that double-click on the desktop works even when Opus itself isn't running (DOpusRT.exe will launch Opus automatically if it's not already running when you double-click).

In order to trap double-clicks on the desktop (which runs in another process to Opus) it's necessary to "inject code" into Explorer - if you have an anti-virus or anti-spyware tool installed you may find it detects this and complains. If you find that double-click on the desktop isn't working check if something is blocking DOpusRT.exe from hooking into Explorer or from running on startup.

The Restart DOpusRT.exe button can be used when troubleshooting problems. It will attempt to stop any current instance of DOpusRT.exe and start a new one. It will also tell you if the whole Opus process is running elevated, which can cause problems by preventing messages from Explorer reaching Opus.

If you click the Restart DOpusRT.exe button and find that desktop double-click starts working, but then fails again after the next reboot, one possibility is a conflict with another program which is started after DOpusRT.exe when you reboot. You can use the Delay DOpusRT.exe option to make it wait a specified number of seconds before starting to work around that kind of problem. The exact delay needed will depend on the software causing the conflict.