(abbrev-file-name): Drive letter can go beyond `Z' under MS-DOS/Novell.
(auto-mode-alist): Support txt and txi like text and texi. (backup-buffer): Use convert-standard-filename. (basic-save-buffer-1): Make the name of the temporary file (where precious files are saved) conform to MS-DOS 8+3 constraints. (convert-standard-filename): New function.
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