Currently, libpng (and by extension tools that rely on it, like xviewer and ffmpeg), are completely unable to render damaged PNG files, where as on Windows, the built-in image viewer and Microsoft Paint do try rendering a damaged PNG file.

Of course, the PNG file will appear with glitches, as would be expected from a damaged file, but that's still far better than showing nothing at all.

If the damage is near the end of a PNG file, most of the PNG file should still be able to be shown, but libpng doesn't try rendering the image at all.