Pfm extension stands for Printer Font Metrics file. You may try to open pfm files with Font Creator software.
It is a font measure file. It is an Adobe product and it includes character sizes. It should be in the same folder with .pfd extension file for opening. Also, you have a chance to keep pfm files in \PSFONTS\PFM\ folder which is found in Photoshop software.
You may try to open pfm files with Font Creator software.
What to use PFM
which page related to PFM file
PFM Related Searches
You can check related links about PFM fileextension.