'how can i convert stl to my vb6 programs file type

how can i convert stl to the file type of my vb6 program. My vb6 program is a 3d viewer, the file type is .prt. .prt is a mesh model, just like stl (not unigraphics .prt). This file type is special, only my vb6 program can read it. This is the file type of my vb6 project (.prt)

Inside the file:

enter image description here

please help me.

vb6


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