It's indeed a bug in Windows 10 1803. There's a workaround for the problem in WinSCP 5.13.2:
https://winscp.net/tracker/1644

andreas wrote:

Completely reinstalling winscp 5.13.2 seems to have solved the issue for me

Thank you! This has resolved the issue! Run the setup as new installation and not update :) thank you!

Completely reinstalling winscp 5.13.2 seems to have solved the issue for me

I've a similar issue since upgrading to Windows 10 1803: when dragging and dropping a remote file to a local directory, then the dialog appearing is not using this directory but is instead showing the target directory that was previously used when downloading a file.

As I didn't change winscp between the windows upgrade process, I assume that the bug is caused by the new windows version as everything was fine with windows 10 1709.
I've now upgraded to winscp 5.13.1 but the problem is still there.

Hi, after the last update to the version 5.13.2 when i take a file and drag in into the Desktop the file are not saved on the Desktop but on Documents.

How I can fix this wrong and bad issue? Should I return to old version?