Had the same problem some years ago.
My solution:
Import to Verto Studio 3d ( free program) and export obj. file.
Problem solved.
You can probably do the same with Blender, also free.
cec
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EDIT:
If you are working on a Mac or iPad, Verto Studio is still free.
The Windows version is no longer free. Sorry.
Thank you Hans :)
CEC
