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First open the file with OpenIV.
Next click on the savecontent/Export
This will give you a folder that looks like this.
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That .FULL file is the mesh.
Just open that up in model researcher.
Padding I found is different in each .YFT.
This a a helper I use in finding stuff.
FF FF FF FF (Begin) Vertex
LOOK FOR [80 3F] UV's
END [00 00 FF 00]
PAD VERT = 56
PAD FACE = 0
PAD UV = 60
Each one is different like I said but you are able to extract the file.
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I did this bus last year.