Yes I did. I did the most comprehensive search I could manage on my C: drive, and also on the portable drive; then I browsed the application folder myself in case the search missed something. It wouldn't be the first time...

To be honest, poser.ini does exist in one place on my system: a folder where I keep backups of my settings. I don't know why Poser would start looking in there, I didn't tell it to (not even sure I can tell it to, anyway); besides, the backup files' dates don't get updated when I run Poser.