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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 1: What are Operating Systems and How Do They Work?

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File Naming Conventions (Most Common Extensions)

The Windows file naming convention is made up of a descriptive name, followed by a full stop and three letters. This full stop and three letters (for example “.doc”) are referred to as the file name extension. The extension is used by Windows to determine the type of data in a file, and which programs can be used to open the file. File extensions and associations were discussed earlier in the book.

Some of the most common file extensions are shown in Table 5.


Table 5: Common File Extensions

Extension

File type

.EXE

Executable file

.BAT

Batch file containing scripting commands

.VBS

Visual Basic Scripting file

.SYS

Core operating system file

.DLL

Dynamic Link Library

.VXD

Virtual device driver file

.INI

Text file storing configuration settings

.COM

Special type of executable file

.BMP

Windows or OS/2 Bitmap image

.JPG

Jpeg compressed image

.GIF

GIF compressed image

.PNG

Portable Network Graphics image

.DOC

Microsoft Word document

.TXT

Plain text file

.ZIP

WinZip or PKZIP compressed archive

.RAR

RAR compressed archive

.ISO

CD IS09660 image

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The “Creator Owner”
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