What is the purpose of the file extension?

The file extension is the three letter file type designation following a period at the end of a file name. It determines what type of file that file will be treated as.

Changing a text (.txt) document to .wmv will make the computer treat it as a Windows Media Video file and thus it will be opened with your default program for viewing .wmv format videos.
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In Unix

Why do files in Unix not require file extensions?

The simple answer is that Unix does not use extensions for program associations. Everything in Unix is a file, whether it is a device, a data file, or a program. In Unix it (MORE)

What to Know When You Want to Fix File Extensions

With the spread of the home computer, there is also a growing need for the populace to be able to maintain its own computers. What once required a computer technician to deal (MORE)

Extensions List: How to Identify Files by Extensions

You've just received a file. You check your file extension list to see if you can open it. When it comes to file sharing, it is not always easy to know the different extension (MORE)
In IRS

Filing a Tax Return Extension With the IRS Online

If your tax deadline is looming before you, you get to relax a bit in knowing that the IRS allows you to request a six-month extension to file your taxes. Here's how to file y (MORE)

Save the Date: Deadlines for Filing an Income Tax Extension

A tax file extension deadline is a way to extend the length of time you have to prepare your tax paperwork. Many people are not aware that a filing extension exists, and those (MORE)

What is the file extension for an Microsoft Excel file?

Excel saves files using a .xls extension (Excel 2003 and earlier) or .xlsx extenstion (Excel 2007 and later).
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What is the file extension of a MySQL database?

The file extension of a MySQL database is .frm I know MySQL uses several storage engines: MyISAM, InnoDB, Memory, Merge, CSV, Example and many more. In MyISAM: There are thre (MORE)

What is a file extension?

A file extension is a three character designation that tells software about the format of the data within the file. For example, a ".rtf" file is in rich text format which req (MORE)

What is the file extension for plain text?

There is no answer for this, because it is the wrong question. A files extension doesn't matter to the file, it only exists so that the Operating System (OS) knows what applic (MORE)