Microsoft Platform SDK June 2001 Edition
(Windows XP RC1)
You can download this from the Platform SDK Update site or order it on CD from the Microsoft Developer's Toolbox.

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Windows XP Visual Specification Guide
This is a preliminary set of guidelines that will help developers and designers adopt the new Windows XP look and feel. This guide walks through some of the design specifications as well as the implementation details for using themeing in an application. The content of the cookbook contains information on themeing, side by side, ComCtl as well as icons and other implementation considerations. This document is a must-read for anyone creating an application for Windows XP.

Application Specifications for the Designed for Windows XP Logo
Microsoft developed this specification to identify applications that run successfully on Windows XP and provide a quality user experience. It will help you define the minimum requirements for applications to operate on Windows XP. Sections include: How to Comply with Windows Fundamental Requirements; Install/Uninstall Requirements; Data and Settings Management; Checklist for Windows XP Compatibility; and more. Meeting these specifications will qualify your application for the Designed for Windows XP Logo