Where can I download Windows Automation API from?
See the question and my original answer on StackOverflowThe Windows Automation API is provided out-of-the-box with Windows starting with Vista (with Windoww XP, you need to download a redistributable package).
The Windows SDK provides the necessary .h files (UIAutomation.h, UIAutomationClient.h, UIAutomationCore.h, UIAutomationCoreApi.h) in the standard include directory.