Common File Types

Video Files

.3g2   3GPP2 Multimedia File
.3gp   3GPP Multimedia File
.asf    Advanced Systems Format File
.asx   Microsoft ASF Redirector File
.avi    Audio Video Interleave File
.flv    Flash Video File
.mov   Apple QuickTime Movie
.mp4    MPEG-4 Video File
.mpg  MPEG Video File
.rm     Real Media File
.srt     SubRip Subtitle File
.swf   Shockwave Flash Movie
.vob   DVD Video Object File
.wmv   Windows Media Video File

3D Image Files

.3dm  Rhino 3D Model
.3ds   3D Studio Scene
.max   3ds Max Scene File
.obj    Wavefront 3D Object File

Raster Image Files

.bmp   Bitmap Image File
.dds   DirectDraw Surface
.gif   Graphical Interchange Format File
.jpg   JPEG (Joint Photographic Experts Group)Image
.png   Portable Network Graphic
.psd   Adobe Photoshop Document
.pspimage   PaintShop Pro Image
.tga   Targa Graphic
.thm   Thumbnail Image File
.tif    Tagged Image File
.tiff   Tagged Image File Format
.yuv   YUV Encoded Image File

Vector Image Files

.ai   Adobe Illustrator File
.eps    Encapsulated PostScript File
.ps    PostScript File
.svg    Scalable Vector Graphics File

Page Layout Files

.indd   Adobe InDesign Document
.pct   Picture File
.pdf    Portable Document Format File

Spreadsheet Files

.xlr    Works Spreadsheet
.xls    Excel Spreadsheet
.xlsx    Microsoft Excel Open XML Spreadsheet

Database Files

.accdb   Access 2007 Database File
.db    Database File
.dbf    Database File
.mdb     Microsoft Access Database
.pdb    Program Database
.sql    Structured Query Language Data File

Executable Files

.apk   Android Package File
.app   Mac OS X Application
.bat    DOS Batch File
.cgi    Common Gateway Interface Script
.com   DOS Command File
.exe    Windows Executable File
.gadget    Windows Gadget
.jar   Java Archive File
.pif    Program Information File
.vb    VBScript File
.wsf    Windows Script File

Game Files

.dem   Video Game Demo File
.gam    Saved Game File
.nes    Nintendo (NES) ROM File
.rom    N64 Game ROM File
.sav    Saved Game

CAD Files

.dwg    AutoCAD Drawing Database File
.dxf    Drawing Exchange Format File

GIS Files

.gpx    GPS Exchange File
.kml    Keyhole Markup Language File

Web Files

.asp   Active Server Page
.aspx    Active Server Page Extended File
.cer   Internet  Security Certificate
.cfm    ColdFusion Markup File
.csr    Certificate Signing Request File
.css    Cascading Style Sheet
.htm   Hypertext Markup Language File
.html   Hypertext Markup Language File
.js     JavaScript File
.jsp    Java Server Page
.php    PHP Source Code File
.rss     Rich Site Summary
.xhtml     Extensible Hypertext Markup Language File

Plugin Files   

.crx    Chrome Extension
.plugin     Mac OS X Plug-in