Where is the config file?

So I downloaded the newest version of hwinfo64. It was the portable zip that presumable doesn't install anything and just runs from an .exe.

The previous version was also the portable zip.

But when I ran the newest version, it "knew" my configuration and what temps I wanted hidden and shown. That shouldn't be possible unless the config file is in a main folder somewhere.
Such settings are kept in the registry even for the portable version.
If you wish to have it absolutely portable, then disable the "Remember Preferences" option in the Configure options. This setting is kept in the HWiNFO64.INI file. With this option, there should be nothing left on the machine when you close HWiNFO.