File Extensions

.txt

A text file that contains textual without any formatting.

TO show file name extensions in windows

For Windows Vista, Windows 7, and Windows Server 2008 Start Windows Explorer, you can do this by opening up any folder. Click Organize. Click Folder and search options. Click the View tab. Scroll down until you notice Hide extensions for known file types, un-check this line by clicking the check box. Note To hide file name extensions, check this line. Click OK

File Extensions

Is the letters immediately shown after the last period in a file name

.wav

A WAV, or Waveform Audio File Format, is a audio file format used to store audio on PCs.

.doc

A Word Document,or DOC, file is the extension that word would save its documents.

.xls

An Excel Document, or XLS, was the standard file format that Microsoft Excel would saved files as. This was changed to .xlsx starting with Excel 2007.

.m

An MP3 file is the most common file format used to store digital audio for use on computers and digital media devices.

File Extension .txt

This extension allows the operating system to know what type of file it is and what program to run when you double-click on it.

Operating System

system knows what programs to use in order to view, print, or edit a particular file by looking at its file extension.