File extension
A file extension (or merely "extension") is that the suffix at the top of a computer filename that indicates what variety of file it's. for instance, within the computer filename "myreport.txt," the .TXT is that the file extension. It indicates the file may be a text document. another examples embrace .DOCX, that is employed for Microsoft Word documents, and .PSD, that is that the commonplace file extension for Photoshop documents.
While most file extensions square measure 3 characters long, they'll be as short collectively character or longer than twenty characters. generally long file extensions square measure wont to a lot of clearly determine the file kind. for instance, the .TAX2015 file extension is employed to spot TurboTax 2015 tax returns and therefore the .DESKTHEMEPACK extension identifies Windows eight desktop themes. The file extension determines that program is employed to open the file additionally as what icon ought to be displayed for the file. It conjointly helps you see what quite file an explicit document is by simply gazing the computer filename.
Both Windows and macintosh OS X permit you to manually amendment file extensions, which can conjointly amendment the program the pc uses to open the file. whereas this may work for a few files, it's going to conjointly cause the file to not open in the least. for instance, if you alter a file with a ".txt" extension to a ".doc" extension, Microsoft Word should still open it. However, if you alter a ".txt" file to a ".psd" file, Photoshop won't acknowledge or open the file.
Since there square measure tens of thousands of file varieties, there are tens of thousands of file extensions. whereas it's going to not be doable to recollect all of them, it's useful to find out a number of the a lot of common ones, such as .JPG, .GIF, .MP3, .ZIP, .HTML, and others. For a listing of common file extensions and their associated file varieties, visit FileInfo.com's Common File varieties page.
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