Extension:ExtensionFunctions.php

This extension contains functions useful to extensions, which work regardless of the version of the MediaWiki core.

Description
ExtensionFunctions.php is a (rather useless) meta-include that Tim Starling introduced when he migrated a lot of extensions to a new special page call format between MediaWiki 1.6 and 1.7. Certain extensions that aren't directly cross-compatible with both (I personally, for instance, try to make mine work without it) require it.

The file was removed in 75805. It can still be retrieved at http://svn.wikimedia.org/svnroot/mediawiki/branches/REL1_16/extensions/ExtensionFunctions.php