Sometimes when I save certain images from particular imageboards, I cannot preview or open those on Mac OS. They work fine on Windows, but I cannot even edit those on Mac OS using graphic editors. If you ever saw this infinitely loading preview, then you know what I am talking about:
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So far my solution was to re-save the picture on Windows using GIMP or something else, but as I suspected it can actually be fixed on Mac OS as well - by editing the file in a HEX editor.