>
>>>> It /might/ be because - surprise! - they're not PNG files at all; they
>>>> have a .png extension, but really they're BMP files.
>
> Yay!  It's always so comforting when Windows deceives me with a superficially
> _believable_ lie.  :\
>
> It's not POV-Ray's fault, it windows saving a cropped image as png but with the
> bmp file format - and then displaying a thumbnail in the directory.
> I'll look for a better bare-bones graphics program to do simple tasks.  No need
> to load in Paint.net or the Gimp just to do a quick crop-paste...
>
>

For that, you can try IrfanView.
It's a very nice media viewer that can be used to crop images, adjust 
contrast, brightness and gamma and apply several filters. Free and 
lightweight.
It can read and save images in most formats.

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