Open image files using Irfanview

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@How to stop the Opus image viewer from being used by default

Overriding the image viewer used within Opus Whether or not Opus uses its own viewer for double-clicks on images within Opus is controlled by this Preferences setting: Preferences / File Operations / Double-click on Files: Use internal picture view…

Thanks. That must have been the world record for fast response with solution. It works!