On computers and mobile devices, file extensions are the suffixes that apps append to filenames. When you see an item like "document.docx" for example, the .docx extension tells the computer and the ...
I use my Mac in a multi OS environment (i.e. with Windows) and whenever I take a screenshot (Cmd-Shift-4) intended for a PC user, I have to go to information and tell the OS not to hide the extension ...
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