--- Operating System, Graphics card ---Windows 8, inter (R) HD Graphic


--- Blender version with error, and version that worked --- blender 2.69, 2.65 works fine


--- Short description of error --- cannot save RGBA channel to image.


--- Steps for others to reproduce the error (preferably based on attached .blend file) --- simply create scene you want to save RGBA to by clicking RGBA button on the render panel.