Please Help me,i need some information

I’m here for some information about this model format,its extension is YOBJ.I’m providing a sample model file and textures below.

also here is a blender script which opens the model in blender 2.49!1llHUb5a!14iCHUtlmFL_aPvICWaeoYXcRNffzfFuFzagDCTwriE

Unfortunately this script doesn’t export the model back to the same format after editing.
Blender script is greek to me,else i would have deciphered the face and u-v data from the script itself.
I need some expert to shed some light on the face format and the U-V data

here are some details of the format which i know