TMPL_129_Exts.txt
Number Entries: list (2-byte one-based item count)
  File Extension: pstring (1-byte length; 9 bytes reserved)
  To Creator: 4-byte integer (char)
  To Type: 4-byte integer (char)

TMPL_128_CNVT.txt
Number Entries: list (2-byte one-based item count)
  From Creator: 4-byte integer (char)
  From Type: 4-byte integer (char)
  To Creator: 4-byte integer (char)
  To Type: 4-byte integer (char)