Hi HåkanL,
I understand you want to know how to find the .inf files.
I will be happy to help you.
The one .inf file that I am aware of is the autorun.inf when running add a printer wizard, you can direct it to autorun.inf to install the drivers on the Windows computer.
The only other thing I could suggest is do a search for *.inf.
I have provided the URL for the HP LaserJet Pro CM1415fnw Color Multifunction Printer Drivers.
Hope this resolves your issue.
Thank you for posting on the HP Forums.
Have a good day!