Convert m3d to obj

Download and install the latest version of Filestar.
Right click on one or more M3d file(s) on your desktop and select Convert with Filestar.
Type convert to obj in the search box.
Press Convert.

What is the difference between .m3d and .obj?

Name: Model 3D; Wavefront Object
Extension: .m3d; .obj
Format: Binary
Category: 3D; 3D
Developer: bzt; Wavefront Technologies
Description: Compressed 3D model in the Model 3D (M3D) format, an open binary mesh format for games; It is one of the most important files in 3D printing and graphics programs. OBJ is a neutral interchange format for storage of non-animated 3D models.
MIME Type: model/wavefront-obj
Wikipedia: .obj on Wikipedia