Available from version 1.24.0 (Gerrit change 141240)
Allows MW extensions to further improve the MIME type detected by considering the file extension.
Define function:
public static function onMimeMagicImproveFromExtension( $mimeAnalyzer, $ext, &$mime ) { ... }
Attach hook: In extension.json:
	"Hooks": {
		"MimeMagicImproveFromExtension": "MediaWiki\\Extension\\MyExtension\\Hooks::onMimeMagicImproveFromExtension"
Called from: File(s): ServiceWiring.php
Function(s): MimeAnalyzer::extCallback
Interface: MimeMagicImproveFromExtensionHook.php

For more information about attaching hooks, see Manual:Hooks .
For examples of extensions using this hook, see Category:MimeMagicImproveFromExtension extensions.

Details edit

Instance of MimeMagic.
File extension.
MIME type (in/out).