when I create a file on the desktop (right click, new, text document) then I change the extension directly from .txt to .nfo
I double click on the new file to open it, notepad++ opens and closes directly.
I uninstalled everything, Ccleaner, reinstalled, same thing…
Same without plug-ins…
I also tried with the portable version… same

I dry…

Windows event log shows this:

Faulting application name notepad++.exe, version: 8.4.2.0, timestamp: 0x629387dd
Faulting module name: notepad++.exe, version: 8.4.2.0, timestamp: 0x629387dd
Exception code: 0xc000041d
Error offset: 0x0000000000349027
Faulting process ID: 0x1cdc
Faulting application start time: 0x01d88886b539f117
Faulting Application Path: C:\Program Files\Notepad++\notepad++.exe
Faulting module path: C:\Program Files\Notepad++\notepad++.exe
Report ID: a8d7f788-2a16-42f1-95cc-c59ed4b45b47
Full name of the failing package:
Application ID relative to the failing package:

Debug:

Notepad++ v8.4.2   (64-bit)
Build time : May 29 2022 - 16:47:30
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : $COMMAND_LINE_PLACEHOLDER$
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
OS Name : Windows 10 Home (64-bit) 
OS Version : 21H1
OS Build : 19043.1766
Current ANSI codepage : 1252
Plugins : 
 NppConverter (4.4)