can you point me to any of these sources for the MAX file format specifications / preview?
I am quite sure that this does not exist - but would be happy to be corrected.
I made a rough prototype using the 3d-Graphics in WPF, obviously this can only work with meshes inside of .3dm files as I still don’t know how to get those render meshes 
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Hi @lando.schumpich,
This should do it.
Brep brep = ...
var mesh = new Mesh();
foreach (var face in brep.Faces)
mesh.Append(face.GetMesh(MeshType.Render))
mesh.Normals.ComputeNormals();
mesh.Compact();
– Dale
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@atair, look at this source code…
http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=8303&lngWId=10
They are exist…
Thanks @lando.schumpich
Could you please share the source code or tell us how you do it?
Thanks for your help. I much appreciate it.
Its on my github: https://github.com/DerLando/RhinoPreview
but really it’s super rough still don’t expect too much
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…yeah… that is not 3ds MAX but 3ds studio DOS from 1992 - the Max format is not open. There were some basic readers in the early 2000s but they are long gone and the format adapted.
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@atair, I tried it and it works on Windows 10 Pro environment… I convert Rhino 3DM files to 3DS files and used this code to view them with no problem…
Anyway, the solution provided by @lando.schumpich is the one who I was looking for.
Great thanks for all of you team… You’re a legend 