3dmf to 3dm

Can someone please tell me how to convert 3dmf file to a 3dm

What application uses 3dmf files?
That’s not a file format i’m familiar with.

a super old mac program

quickdraw metafile

You might contact Okino:

https://www.okino.com/conv/conv.htm

https://www.okino.com/conv/imp_3dmf.htm

AccuTrans3D
http://www.micromouse.ca/file_formats.html