Gopher types supported by Netscape Navigator

Netscape Navigator supports the following gopher types:
  /* Gopher types:*/
  #define GTYPE_TEXT      '0'     /* text/plain */
  #define GTYPE_MENU      '1'     /* menu - becomes text/html */
  #define GTYPE_CSO       '2'     /* cso search - becomes text/html */
  #define GTYPE_ERROR     '3'     /* some sort of error */
  #define GTYPE_MACBINHEX '4'     /* application/binhex */
  #define GTYPE_PCBINARY  '5'     /* application/octet-stream */
  #define GTYPE_UUENCODED '6'     /* application/uuencoded */
  #define GTYPE_INDEX     '7'     /* search - becomes text/html */
  #define GTYPE_TELNET    '8'     /* maps to telnet URL */
  #define GTYPE_BINARY    '9'     /* application/octet-stream */
  #define GTYPE_GIF       'g'     /* image/gif */
  #define GTYPE_HTML      'h'     /* HTML URL */
  #define GTYPE_HTMLCAPS  'H'     /* HTML URL Capitalized */
  #define GTYPE_INFO      'i'     /* unselectable info */
  #define GTYPE_IMAGE     'I'     /* image/gif */
  #define GTYPE_MIME      'm'     /* not used (what to do?) */
  #define GTYPE_SOUND     's'     /* audio/(wildcard) */
  #define GTYPE_TN3270    'T'     /* maps to tn3270 program (url) */
  #define GTYPE_WWW       'w'     /* W3 address */
  #define GTYPE_MPEG      ';'     /* video/mpeg */