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File Types

How To Convert a File that won't work

1. Use a Program

You can convert files from one format to another using the tools that are already built into many programs like Word, PowerPoint, or Excel.  

2. Web Based Tools

Online-Convert is my favorite right now.

What is a file extension?

A file extension is a set of 3 or 4 letters/numbers added to the end of a file name to let the computer know what kind of program to use to open that file.  These are important because computers have many different kinds of programs and files, so knowing which ones go together is the job of a file extension.

File Extension Examples

Click on the blue file extension below for more information.

Text Files

.docMicrosoft Word 2000 or 2003 Document
.docxMicrosoft Word 2010 or 2007 Document
.pagesPages Document
.rtfRich Text Format File
.txtPlain Text File
.wpdWordPerfect Document
.wpsMicrosoft Works Word Processor Document

Data Files

.csvComma Separated Values File
.datData File
.ppsPowerPoint 2000 or 2003 Slide Show
.keyKeynote Presentation
.pptxPowerPoint 2007 or 2010 Presentation
.pptPowerPoint 2000 or 2003 Presentation
.xmlXML File

Audio Files

.aacAdvanced Audio Coding File (used by iTunes)
.aifAudio Interchange File Format
.iffInterchange File Format
.m3uMedia Playlist File
.midMIDI File
.mp3MP3 Audio File
.mpaMPEG-2 Audio File
.raReal Audio File
.wavWAVE Audio File
.wmaWindows Media Audio File

Video Files

.3g23GPP2 Multimedia File
.3gp3GPP Multimedia File
.asfAdvanced Systems Format File
.asxMicrosoft ASF Redirector File
.aviAudio Video Interleave File
.flvFlash Video File
.movApple QuickTime Movie
.mp4MPEG-4 Video File
.mpgMPEG Video File
.rmReal Media File
.swfShockwave Flash Movie
.vobDVD Video Object File
.wmvWindows Media Video File

3D Image Files

.3dmRhino 3D Model
.max3ds Max Scene File

Image Files - image quality will improve/degrade as you scale up/down in size

.bmpBitmap Image File
.gifGraphical Interchange Format File
.jpgJPEG Image File
.pngPortable Network Graphic
.psdAdobe Photoshop Document
.pspimagePaintShop Photo Pro Image
.thmThumbnail Image File
.tifTagged Image File

Vector Image Files - can be scaled up or down with no loss of quality

.aiAdobe Illustrator File
.drwDrawing File
.epsEncapsulated PostScript File
.psPostScript File
.svgScalable Vector Graphics File

Page Layout Files

.inddAdobe InDesign Document
.pctPicture File
.pdfPortable Document Format File

Spreadsheet Files

.wksWorks Spreadsheet
.xlsExcel 2000 or 2003 Spreadsheet
.xlsxMicrosoft Excel 2007 or 2010 Spreadsheet

Database Files

.accdbAccess 2007 or 2010 Database File
.dbDatabase File
.mdbMicrosoft Access Database
.pdbProgram Database
.sqlStructured Query Language Data

Executable Files

.appMac OS X Application
.batDOS Batch File
.cgiCommon Gateway Interface Script
.comDOS Command File
.exeWindows Executable File
.gadgetWindows Gadget
.jarJava Archive File
.pifProgram Information File
.vbVBScript File
.wsfWindows Script File

Game Files

.gamSaved Game File
.nesNintendo (NES) ROM File
.romN64 Game ROM File
.savSaved Game

CAD Files - (CAD = Computer Aided Design - engineering drawings)

.dwgAutoCAD Drawing Database File
.dxfDrawing Exchange Format File

Web Files

.aspActive Server Page
.cerInternet Security Certificate
.csrCertificate Signing Request File
.cssCascading Style Sheet
.htmHypertext Markup Language File
.htmlHypertext Markup Language File
.jsJavaScript File
.jspJava Server Page
.phpHypertext Preprocessor File
.rssRich Site Summary
.xhtmlExtensible Hypertext Markup Language File

Plugin Files

.8biPhotoshop Plug-in
.pluginMac OS X Plug-in
.xllExcel Add-In File

Font Files

.fntWindows Font File
.fonGeneric Font File
.otfOpenType Font
.ttfTrueType Font

System Files

.cabWindows Cabinet File
.cplWindows Control Panel Item
.curWindows Cursor
.dllDynamic Link Library
.dmpWindows Memory Dump
.drvDevice Driver
.lnkFile Shortcut
.sysWindows System File

Settings Files

.cfgConfiguration File
.iniWindows Initialization File
.keychainMac OS X Keychain File
.prfOutlook Profile File

Encoded Files

.binMacbinary Encoded File

Compressed Files

.pkgMac OS X Installer Package
.zipZipped File
.sitStuffit Archive
.sitxStuffit X Archive

Disk Image Files

.dmgMac OS X Disk Image
.isoDisc Image File
.vcdVirtual CD

Developer Files

.cC/C++ Source Code File
.classJava Class File
.cppC++ Source Code File
.csVisual C# Source Code File
.dtdDocument Type Definition File
.flaAdobe Flash Animation
.javaJava Source Code File
.mObjective-C Implementation File
.plPerl Script

Backup Files

.bakBackup File
.tmpTemporary File

Misc Files

.dbxOutlook Express E-mail Folder
.msiWindows Installer Package
.partPartially Downloaded File

Bryan Tayman,
Dec 13, 2011, 6:04 AM