Notes about the MF1 file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The MF1 file type is primarily associated with 'NXI-deas' by Ford. Software originally developed by Ford in the 80's. This file type is legacy as Siemens ultimately owns NX now. They did away with I-deas and simply call it NX now and use a different file structure. MF1 files are your main model files and essentially contain the part files info.