AI message appears when opening Nef files

Try resetting your ACR preferences, better?
Hold down the Command key and select Photoshop > Preferences > Camera Raw (MacOS) or hold down the Ctrl key and select Edit > Preferences > Camera Raw (Windows).
Click Yes in the dialog that asks "Delete the Camera Raw Preferences?"

Hi @Michal27937998xs5k sorry you are having issues.

Let's make sure we're in a default state and there are no stale settings somewhere: 

Restore your preferences using this manual method:  

https://helpx.adobe.com/photoshop/using/preferences.html#Manually  

Does it work correctly? 

If that doesn't solve it, you can quit Photoshop and put the Settings folder back. 

It may help if we could see your Photoshop System Info. Launch Photoshop, and select Help >System Info...and copy/paste the text in a reply.  

Thank you,

Cory

Hi

Take a look at my reply in this thread to see if it helps

https://community.adobe.com/t5/photoshop-ecosystem-bugs/photoshop-h%C3%A4ngt-sich-auf-nach-der-nutzung-von-camera-raw-auf/idc-p/13488332#M73437