Virtual font metrics are usually created in a textual form, the Virtual Property List, but programs that use them need to use binary files (the Virtual Font and the TeX Font Metric). The present two programs translate between the two forms:
– vptovf takes a VPL file and generates a VF file and a TFM file;
– vftovp takes a VF file and a TFM file and generates a VPL file.

The programs are to be found in every distribution of TeX.

The author is Donald E. Knuth.