The snipping tool in Windows is sufficient for quick screenshots. The only (and annoying) problem is that it saves all files with a uppercase PNG extension, e. g.
As there are no options in the software to change this behavior, can somebody provide a hack to save files with a lower-case
PS1: This question was asked in Aug 2009 on microsoft.com. The answer: "Delete the PNG and type in png." -- The reply: "TOTAL FAIL"
PS2: Problem still exists in Windows 10. I used the Feedback Hub to report about it and hope the Microsoft developers will fix this finally.