A few months ago, I worked on some very simple samples that demonstrate how to program Windows touch applications in Win32 using GDI for drawing and C++ as the underlying programming language. C++ Source code accompanying the Windows Touch Screencasts is available on code gallery. Appologies for the video not properly embedding, the embed code on the MSDN video player seems to have a bug in it.
Windows Touch 101: Simple GDI programming and hooking Windows Touch to Win32 Applications in C++
Windows Touch 110: Using the Manipulation Processor in a Simple Win32 and GDI application in C++
Windows Touch 120: Adding Inertia to an Application using the Manipulation Processor in C++
Useless. Why take a whole screen bitmap and convert it into a 550 x 412 PNG file.
It will probably be illegible and it sure as hell is