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File Extensions

File Extension Definition

File Extensions are the letters/numbers at the end of a filename (after the period) that denote what type of file it is.

They are important because without them, the computer will not know how to interpret the file.

Example of file extensions:
.html .php .asp .mp3 .png .vrml .htm .aiff .jpg .mov .txt .wav .gif .mpg .xml .au .swf

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