Best place to put preferences on a PC?

[Arthur Rann]

Hi,

I appreciate the help with other issues I had earlier, but I still don't
know where to put preference files on a PC. Any thoughts? Do prefs files
even exist on a PC? I want to store my users' serial number somewhere that
my app can reference when it runs. On the Mac, this is going in the prefs
folder. Where do I put them on a PC?

Thank you,
Art