Do you have any idea where did the 411 came from?

I have found the problem. The editor preference was wrong.

The "external editor" line said:

"C:\Program Files (x86)\Notepad++\notepad++.exe" 411 !.!

Changing it to:

"C:\Program Files (x86)\Notepad++\notepad++.exe" !.!

solved the problem.

It somehow has to something with how Notepad++ is opened.

I came across this article: git - -w doesn't exist. Create it? - Stack Overflow

So it seems like WinScp is sending some extra information to the command line for Notepad++ to open.

Here is some logging:

. 2016-11-15 11:02:14.966 Startup conversation with host finished.
. 2016-11-15 11:02:23.344 Copying 1 files/directories to local directory "C:\Users\j.bos\AppData\Local\Temp\scp02221\aix-inet24-001%2Funipaas@aix-inet24-001.mover.local\inet24\nl\temp\"
. 2016-11-15 11:02:23.344 PrTime: Yes; PrRO: No; Rght: rwxrwxr-x; PrR: No (No); FnCs: N; RIC: 0100; Resume: S (102400); CalcS: Yes; Mask:
. 2016-11-15 11:02:23.344 TM: A; ClAr: No; RemEOF: No; RemBOM: No; CPS: 0; NewerOnly: No; InclM: ; ResumeL: 0
. 2016-11-15 11:02:23.344 AscM: *.*html; *.htm; *.txt; *.php; *.php3; *.cgi; *.c; *.cpp; *.h; *.pas; *.bas; *.tex; *.pl; .htaccess; *.xtml; *.css; *.cfg; *.ini; *.sh; *.xml;*.lng
. 2016-11-15 11:02:23.344 File: '/inet24/nl/temp/BLK00001010137914324.tmp' [2016-11-15T09:31:54.000Z] [999]
. 2016-11-15 11:02:23.346 Copying "/inet24/nl/temp/BLK00001010137914324.tmp" to local directory started.
. 2016-11-15 11:02:23.346 Ascii transfer mode selected.
. 2016-11-15 11:02:23.346 Opening remote file.
> 2016-11-15 11:02:23.346 Type: SSH_FXP_OPEN, Size: 57, Number: 2307
< 2016-11-15 11:02:23.346 Type: SSH_FXP_STATUS, Size: 24, Number: 2052
. 2016-11-15 11:02:23.346 Discarding reserved response
< 2016-11-15 11:02:23.347 Type: SSH_FXP_HANDLE, Size: 13, Number: 2307
> 2016-11-15 11:02:23.347 Type: SSH_FXP_FSTAT, Size: 13, Number: 2568
< 2016-11-15 11:02:23.349 Type: SSH_FXP_ATTRS, Size: 37, Number: 2568
> 2016-11-15 11:02:23.352 Type: SSH_FXP_READ, Size: 25, Number: 2821
< 2016-11-15 11:02:23.353 Status code: 1
. 2016-11-15 11:02:23.353 3 skipped SSH_FXP_WRITE, SSH_FXP_READ, SSH_FXP_DATA and SSH_FXP_STATUS packets.
> 2016-11-15 11:02:23.353 Type: SSH_FXP_CLOSE, Size: 13, Number: 3332
. 2016-11-15 11:02:23.354 Preserving timestamp [2016-11-15T09:31:54.000Z]
. 2016-11-15 11:02:23.357 Transfer done: '/inet24/nl/temp/BLK00001010137914324.tmp' [999]

Thank you for your answer.

In the attachments, you can see my preferences, action and Notepad++ message.

Regards,

Jeroen Bos

Can you post a screenshot of the message?

Just a wild guess: Doesn't you have this directory misconfigured here?
https://winscp.net/eng/docs/ui_pref_storage

Hello,

Every time I open a file in Notepad++ from the remotedirectory in WinScp, I get the message "current local directory\411 doesn't exist. Create it?"

- Why does WinScp this file to be there and what is the purpose of it?
- Is there maybe a possibility for not needing this file?

Regards,

Jeroen Bos