Turbo's original GIR_Editor [v1.0] only reviewed and extracted from certain resource files according to his change log. I think when he added ability for logo.bin extraction of BMP images in V2.0 that may have been when any bin file containing symbols/images was recognised. Any other .bin file which doesn't contain graphics will be rejected with the message 'Only gir file and logo files are supported' as you know.

There's certainly not any [old-style] .gir files in nuvi-type units' internal files, again as you'd already know. There's none in GMXT or nRoute either. Sorry i don't know of any apart from those in GMPC's program files and have no idea if any others actually exist. Hence my offer to rekit your undies and sock drawers [easier task for me]. Maybe there's something different in old region-only units like StreetPilots?