Re: The full instructions to resolve.
@105059120: You didn't tell us anything about your website. Nor how do you manage it. And this is unlikely a WinSCP question anyway.
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
.png, .jpg, .gif, etc by double-clicking, it just open as text editor. I always have to right click in the image file and click "Open" to open image previewer. I'm using a locally FTP trans protocol. Please fix the problem.