efaq: Editing MS-DOS files
5.46 How can I edit MS-DOS files using Emacs?
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As of Emacs 20, detection and handling of MS-DOS (and Windows) files is
performed transparently. You can open MS-DOS files on a Unix system,
edit it, and save it without having to worry about the file format.
When editing an MS-DOS style file, the mode line will indicate that
it is a DOS file. On Unix and GNU/Linux systems, and also on a
Macintosh, the string ‘(DOS)’ will appear near the left edge of the mode
line; on DOS and Windows, where the DOS end-of-line (EOL) format is the
default, a backslash (‘\’) will appear in the mode line.