DOPUS image viewer remains default for opening images

I have tried setting a few different programs as the default to open images (right click open with, choose default programs, select program and tick box for always use app for opening file type.) The programs I have tried using for the default include the standard Windows Photos and Irfan View. Even after setting those programs as the default, images remain opening with the DOPUS image viewer. Is this something related to DOPUS that is preventing images from opening with those default programs?

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