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Images don’t usually have that extension (that’s usually for dynamically-served webpages that use a PHP backend). To find out what type of file you have, the easiest way is to use the (gasp!) file command (e.g., say you have a file named file1.php, and you wish to know what its type is. Just type “file file1.php” at the command line). Remember that in outside of Windows, file extensions don’t mean that much.
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