Hi, BTW although Microsoft Photo Viewer has been replaced, it is still available (and I prefer it). Quick Picture Viewer has no right click menu I think? Anyway, the other option is to try the free PSP Thumbnail Handler by Bot productions, I seem to have this issue every time windows or PSP updates! this utility is sometimes the answer, though PSP should install its own handler for Explorer (even for win 11). Maybe it is worth asking corel if there is a known issue in win 11?