You can open .3ds, .dae, .dxf, and .obj files via File > Open. Save your file in the originating software (such as Maya) by exporting as an Autodesk (*FBX) file type so you can open the file in MotionBuilder.
To open a file from another 3D package:
The Open File dialog box appears.
Open File dialog box
The Open Options dialog box appears.
Open Options dialog box
To open a file into a scene, see Merging.
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