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(emacs)Compressed Files

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Accessing Compressed Files
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   Emacs comes with a library that can automatically uncompress
compressed files when you visit them, and automatically recompress them
if you alter them and save them.  To enable this feature, type the
command `M-x auto-compression-mode'.  You can enable it permanently by
customizing the option `auto-compression-mode'.

   When automatic compression (which implies automatic uncompression as
well) is enabled, Emacs recognizes compressed files by their file names.
File names ending in `.gz' indicate a file compressed with `gzip'.
Other endings indicate other compression programs.

   Automatic uncompression and compression apply to all the operations
in which Emacs uses the contents of a file.  This includes visiting it,
saving it, inserting its contents into a buffer, loading it, and byte
compiling it.