That was what I suspected too, but I don't know how to change the association back to Paint instead of IrfanView. They don't open in IrfanView unless I drag them there, so that might not be the ...
Something happened to my Dads Macbook air within the last 24 hours. He is complaining that when he tries to open JPEG files in preview the app complains that the files are locked and he can't open ...
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