Tw was taken from:
ftp://ftp.dcs.ed.ac.uk/pub/rasmol/v2.6beta/

Current directory is /pub/rasmol/v2.6beta

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  INSTALL                        16 Kb    Thu Oct 31 00:00:00 1996 
  README                        699 bytes Thu Oct 31 00:00:00 1996 
  RasMol26.tar.gz               736 Kb    Thu Oct 31 00:00:00 1996 Unix Tape Archive
  rasmac26.sit.hqx              644 Kb    Wed Sep 25 00:00:00 1996 Macintosh BinHex Archive
  rasmol.hlp                     56 Kb    Thu Apr 18 00:00:00 1996 
  raswin.exe                    280 Kb    Fri Nov 15 00:00:00 1996 Binary Executable
  raswin.hlp                     64 Kb    Tue Sep 12 00:00:00 1995 
  raswin32.exe                  341 Kb    Tue Nov 19 00:00:00 1996 Binary Executable
  raswinsx.exe                  317 Kb    Fri Nov 15 00:00:00 1996 Binary Executable
  release.doc                    50 Kb    Mon Oct  9 00:00:00 1995 Microsoft Word Document
  release.ps                    103 Kb    Mon Oct  9 00:00:00 1995 Postscript Document
  release.txt                    17 Kb    Mon Oct  9 00:00:00 1995 Plain Text