In this case, please download or copy the file 3DM again. When the file is incomplete, it is not possible to open it correctly.

Check if the file is complete - Sometimes it happens that the 3DM file was not copied completely from the external Flash memory, or downloaded from the Internet.

Check that the system has the necessary resources to run the Rhino OSX application and open the 3DM file.

Check if the icon is an element of the correct file but not only a shortcut to the location where the 3DM file no longer exists.

Check if you, as the operating system user, have appropriate permissions to work with the file 3DM.

Most often it is disinfection or deletion of an infected file. In this case, scan the 3DM file and take the actions recommended by the antivirus program installed on the system.

Check if the 3DM file is not infected - When the file 3DM is infected with a virus or malware, it probably will not be able to be opened correctly.

You should then find out what is the reason of the problem.

Sometimes it happens that despite having the right application and the correct configuration, there are still problems with opening the 3DM files. Check out other possible problems related to 3DM files. Remember! Manually editing the system registry is only recommended for advanced users, and changes made to it without proper knowledge may result in damage to the system.

Finally, select the 'Always use the selected program to open 3DM files' option and confirm the whole operation.

Click 'Find more applications on this PC' and indicate the installation location of the appropriate program.

Right click on the unknown 3DM file you want to open.

The second way is simpler and definitely recommended for less advanced users. This can be done in two ways - one is to manually edit the Windows Registry and HKEY_CLASSES_ROOT keys. If the user already has one of the applications installed, the next step will be to associate it with the file extension 3DM. Associate Rhino OSX with the 3DM file extension

3dm file download