Open .jpg files with Irfanview as Default

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Win10 has apparently 'forgotten' I have had Irfanview as Default program to open .jpg image filesNow have to manually select Irfanview from Open With drop-down (initially it had completely disappeared from menu ... WTH??)Can now find no way to set it as Default programActual .jpg image files (named using Bulk Renamer) somehow show under Properties as "Type of File - File" (Again, WTH??All such files in Windows Explorer simply display doc-like icons, rather than more-appropriate Thumbnails!?Anyone with actual insights into this nonsense -- and, hopefully, some Fix?

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