Switching to a default file in the viewer panel

We added these in Directory Opus 12.16.1 (Beta) to make this kind of thing easier:

  • Added command to tell the Lister viewer pane to open a specific file. e.g. Show VIEWPANECMD="open,C:\My Image.png ".

  • Added Show VIEWPANECMD=clear to unload any current file and clear the viewer pane.