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Ah, the infamous Open NUL issue!

If you are okay with using the registry editor.

Run regedit.exe and go to HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Null . Check the Start key there. If that has a value of anything but 2 (usually 4), please change it to 2. Exit regedit and reboot, then Please try this:

- exit the Steam app entirely
- uninstall Paradox Launcher v2 from the Windows "Apps and features" utility, if still present.

Delete the following folders if still present:

- C:/users/<UserName>/AppData/Local/Programs/Paradox Interactive/
- C:/users/<UserName>/AppData/Local/Paradox Interactive/
- C:/users/<UserName>/AppData/Roaming/Paradox Interactive/launcher-v2/
To see the AppData folder you'll need to enable View Hidden Items in File Explorer.

- run steam.exe as the Windows Admin user

- run the game from the PLAY button in Steam

IF that doesn't help, in this folder are some .log files:
C:/users/<UserName>/AppData/Local/Paradox Interactive/launcher-v2/
Please attach them here.


Good luck with that!