An Assistance Platform (AP) help format based on a new XML-based markup language called Microsoft Assistance Markup Language was originally part of the Longhorn project. It introduced a "guided help" (active content wizard, ACW) feature that highlights what parts of the screen to interact with. It can also use this information to automate a task if the user accepts. Microsoft eventually decided against including ACW in Windows Vista. The compiled .H1s help format, along with the HelpPane viewer, remained in Windows Vista and Windows 7. It is similar to H2's Hxs format. A third party "xHelpMarkup" tool for compiling and decompiling exists, but it is only a wrapper around the BDD 2007 apcompnt and apss.dll tools.
