4TeX PAP files

These files look like 4TeX LST files and are used for defining a list of paper sizes that can be used in combination with a certain printer driver. For instance for the Postscript printer program DVIPS, 4TeX uses the DVIPS.PAP file: 
A4 (210mm x 297mm)
  -t A4
A3 (297mm x 420mm)
  -t A3
letter (8.5in x 11in)
  -t letter
legal (8.5in x 14in)
  -t legal
ledger (17in x 11in)
  -t ledger
tabloid (11in x 17in)
  -t tabloid

For the LaserJet 4 printer program we have the PAP file: DVILJ4.PAP 

A4 (210mm x 297mm)
  -s26
letter (8.5in x 11in)
  -s2
legal (8.5in x 14in)
  -s3
executive (7.25in x 10.5in)
  -s1
monarch (3.875in x 7.5in)
  -s80
commercial-10 (4.125in x 9.5in)
  -s81
international DL (110mm x 220mm)
  -s90
international C5 (162mm  x 229mm)
  -s91