May 12, 2011 Patch (Tools)

{{Patch layout
 * game = tools
 * source = http://forums.steampowered.com/forums/showpost.php?p=22376589&postcount=1
 * source-title = Portal 2 Authoring Tools Update


 * before = N/A
 * after = May 17, 2011 Patch (Tools)


 * notes =

Portal 2 Authoring Tools
}}
 * Fixed problem preventing Windows XP users from starting the SDK
 * Fixed certain keystrokes being ignored by Hammer when browsing models
 * Cleaned up unused entity entries in the included FGDs