Opus viewer opening instead of chosen viewer for jpgs

I have a problem using Dopus 12.22 x64, version 7593 10/15/2020

With Windows 10 64 bit, on an Acer Aspire E15 laptop

** Started Dopus, clicked a .JPG file from a chosen directory.

Pictures are shown, but not with the ACDSEE program I specified.

Two programs are currently active in task manager: Dopus and Task manager.

** In Dopus / settings / file types says that .JPG files should be opened with ACDSEE.

What am I doing wrong, or what should I set, and where, to open the .JPG files in ACDSEE?

What program does show them?