User blog comment:Plasmaster/It's Been A Year...I'm Still Clueless!/@comment-1455034-20131209023653/@comment-3060206-20131210073651

Snipping Tool is a PC tool, and can only save PNG in Windows 7 and above (?). I recall on Vista, it only lets you save JPEG and GIF formats. Apparently there's a program called XnView that also lets you capture screenshots, at least according to NOBODY's transparent images tutorial.