By "sometimes" I mean it happens with certain files every time, but with other files not at all.

I get the same problem using Copy from menu, not just drag-and-drop.

Session protocol : SSH-2

FTP protocol : SFTP-3

Winscp version : 4.0.5

martin wrote:

I'm not able to reproduce the problem.

What does it mean sometimes? Is the problem intermittent? Or does it happen with some file only? I mean does it happen whenever you download file DOWNUTIL2_SUN_6137663028.txt?

Also does it happen if you download files by other means that drag&drop? E.g. from menu?

What protocol are you using?
What version of WinSCP?

I'm not able to reproduce the problem.

What does it mean sometimes? Is the problem intermittent? Or does it happen with some file only? I mean does it happen whenever you download file DOWNUTIL2_SUN_6137663028.txt?

Also does it happen if you download files by other means that drag&drop? E.g. from menu?

What protocol are you using?
What version of WinSCP?

I'm using drag-and-drop to copy files from the Remote to the Local window, and sometimes filenames get changed, although the contents seem unaffected. For example, filename DOWNUTIL2_SUN_6137663028.txt getting changed to DOWNUTIL2_%53UN_6137663028.txt
So, it looks like some upper-case alphabetics are translated to a code, in the example above S translated to %53