Vim Autoload Scripts and Omni Completion Files

runtime/autoload/README.txt

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The autoload directory is for standard Vim autoload scripts.

These are functions used by plugins and for general use.  They will be loaded
automatically when the function is invoked.  See ":help autoload".

gzip.vim	for editing compressed files
netrw*.vim	browsing (remote) directories and editing remote files
tar.vim		browsing tar files
zip.vim		browsing zip files
paste.vim	common code for mswin.vim and menu.vim
spellfile.vim	downloading of a missing spell file

Omni completion files:
ccomplete.vim		C
csscomplete.vim		HTML / CSS
htmlcomplete.vim	HTML
javascriptcomplete.vim  Javascript
phpcomplete.vim		PHP
pythoncomplete.vim	Python
rubycomplete.vim	Ruby
syntaxcomplete.vim	from syntax highlighting
xmlcomplete.vim		XML (uses files in the xml directory)

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Title: Vim Autoload Scripts and Omni Completion Files

Summary

This section describes the autoload directory in Vim, which contains scripts for functions used by plugins and for general use that are automatically loaded when invoked. It lists specific autoload scripts for editing compressed files, browsing directories and archives, and downloading spell files. It also details Omni completion files for various programming languages like C, CSS, HTML, Javascript, PHP, Python, Ruby, and XML.