The PFM file generator builds the following PFM filename.
| Value | Meaning |
| 1, 2 | First two characters from the font filename. |
| 3 | P, L, or X for portrait, landscape, or both orientations. |
| 4 | B, R, I, or E for bold, roman, italic, or bold/italic (enhanced). |
| 5, 6, 7 | Point size in points. |
| 8 | Magic number. |
The “magic number” is used by the installer to ensure that the filename is unique. It starts out at zero. If a file already exists by that name, it is incremented to 1. The installer continues to increment the number to 9, then A through Z. If it fails to find a unique filename out of the 36 possibilities, then it will not build the PFM file and reports a “Cannot build PFM file” error message.