I have sent a feedback and request to FastStone. BTW, on their homepage, it is mentioned: 'All products work on XP, Vista, Windows 7, Windows 8.x and Windows 10' but if you compare with the last snapshot from Wayback Machine (mars 30, 2015, with FastStone Image Viewer version 5.3) you get: 'All products work on Windows 98, ME, XP, Vista, Windows 7 and Windows 8' so the bad news may be that they already know about that...