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How to open a file with .3dm extension?
File type: Cadent 3D Model (Cadent Inc.)
Compatible with Windows 10, 8.1, 8, 7, Vista and XP
Searching for the right program to open .3dm files?

"You'll need a new app to open this file" is probably the most common error faced by millions of Windows users every day. This is either because the program required to open a file is not available on your system or there may be other issues.
What is .3dm file extension?

Open-source 3D model format that allows CAD, CAM, CAE, and computer graphics software to accurately save and exchange 3D geometry using both NURBS and polygon mesh representations; used as the native file format for Rhinoceros.The 3DM open-source library is available at www.opennurbs.org/.

Windows Desktop Software that can be used to open .3dm files:
McNeel Rhino, Autodesk Fusion 360.

Mac OS Software that can be used to open .3dm files:
McNeel Rhino OSX, IMSI TurboCAD Deluxe v8.