OK, that's me out of ideas I'm afraid. I know that Vista tucks files away in odd places, but other than that, I'm really not familiar with it.
By the way, I posted 2 TOM.bmp files - the top one (blue background) is too big for RadarBox at 60x22, it's for the SBS-1. The bottom one (white background) is the correct size for RadarBox at 76x16 - I just wanted to show you the difference.
However, I do know that RadarBox cannot display a logo if there is no associated bmp file - so you've either managed to do the impossible, or it's hiding there somewhere on your system :-)