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         - Input / output
 Requires DOS version 3.1 or later                              (ngxc & ngxl)
 * Break pressed *                                              (ngxc & ngxl)
 Source file cannot have '.ngo' or '.ng' extension.                    (ngxc)
 Link file cannot have '.ngo' or '.ng' extension.                      (ngxl)
 File not found: ________.___                                   (ngxc & ngxl)
 Warning: cannot find file for !seealso: xxxxx                         (ngxl)
 Couldn't open error file.                                      (ngxc & ngxl)
 Couldn't open .NGO file.                                              (ngxc)
 Couldn't open .NG file.                                               (ngxl)
 Error on input.                                                (ngxc & ngxl)
 Error on output: disk full?                                    (ngxc & ngxl)
 Error: Seek failed.                                            (ngxc & ngxl)
         - Source files
 Error: Unexpected keyword (line _____).                               (ngxc)
 Error: Bad !seealso or !file format (line _____).                     (ngxc)
 Error: The list of short entries is too long (line _____).            (ngxc)
 Error: There are too many references to other files.           (ngxc & ngxl)
 Warning: The list exceeds limit.                                      (ngxc)
 Warning: There is an entry longer than the specified limit.           (ngxc)
 Error: There is an entry longer than the 17,000 bytes limit.          (ngxc)
 Error: Too many !seealso references.                                  (ngxc)
 Warning: cannot find !seealso: xxxxx                           (ngxc & ngxl)
 Warning: invalid format for !seealso: xxxxx                           (ngxl)
         - Link file
 You can only have one '!name:' field.                                 (ngxl)
 You can only have one '!credits:' field.                              (ngxl)
 Warning: There are too many/long lines in the '!credits:' field       (ngxl)
 You must use at least one '!menu:' field.                             (ngxl)
 The '!menu:' field must have a title.                                 (ngxl)
 Menu item must have both a title and a filename.ngo.                  (ngxl)
 There are too many items in menu.                                     (ngxl)
 There are too many menus.                                             (ngxl)
 Error: This is not a Norton Guides object file.                       (ngxl)
 Error: Bad .ngo structure.                                            (ngxl)