wait, scratch that, the lowercase 'g' isn't right. so we're looking for a rounded font with a tapering 'M' and a fancy 'g'.
edit: i think i give up! but also note the way the 't' curves out on the bottom and the 'slant' that the 'a' has. Kabel has a lot of these features but it's not Kabel, that's for sure.
I think he means the simple one-colour bitmap font, like he said is used "for file/folder names".
The font is probably embedded in the gp2xmenu executable. The easiest way to use one is to create your own, or copy someone elses from code they have released.