File extension	The full name of the file	Popularity
File extension 1	Unix Section 1 Man Page
File extension 113	Iomega Backup File
File extension 123	Lotus 1-2-3 Spreadsheet
File extension 123C	Autodesk 123C Drawing
File extension 123D	Autodesk 123D Drawing
File extension 123DX	123D Design Model File
File extension 1PE	TurboTax Form File
File extension 1PH	TurboTax File
File extension 1ST	Readme File
File extension 256	Descent 2 Color Palette File
File extension 264	Ripped Video Data File
File extension 2BP	Pocket PC Bitmap Image File
File extension 2D	VersaCAD 2D Drawing File
File extension 2FS	Puppy Linux Save State File
File extension 2MG	Apple IIGS Disk Image
File extension 2SF	Nintendo DS Sound File
File extension 2SFLIB	Nintendo DS Audio Library File
File extension 323	H.323 Internet Telephony File
File extension 32X	Sega 32X ROM
File extension 360	360desktop Panorama File
File extension 386	Windows Virtual Device Driver
File extension 3D	Survex 3D Cavern File
File extension 3D2	Stereo CAD-3D 2.0 Image File
File extension 3D4	Stereo CAD-3D 2.0 Image File
File extension 3DA	3D Assembly File
File extension 3DC	iGO 3D Building File
File extension 3DD	ArcGlobe Document
File extension 3DF	3D Format
File extension 3DL	LightConverse 3D Model File
File extension 3DM	Rhino 3D Model
File extension 3DMF	QuickDraw 3D Metafile
File extension 3DMK	123D Make Project File
File extension 3DON	Scrutinize 3D Mesh File
File extension 3DP	123D Catch Photo Scene Data File
File extension 3DR	3DMark Results File
File extension 3DS	3D Studio Scene
File extension 3DT	3D Topicscape File
File extension 3DV	3D VRML World
File extension 3DW	3D World Studio 3D project file
File extension 3DX	Rhino 3D graphic
File extension 3DXML	Dassault Systemes 3D XML File
File extension 3FR	Hasselblad 3F RAW Image
File extension 3FS	Puppy Linux Save State File
File extension 3G2	3GPP2 Multimedia File
File extension 3GA	3GPP Audio File
File extension 3GP	3GPP Multimedia File
File extension 3GP2	3GPP Multimedia File
File extension 3GPP	3GPP Media File
File extension 3GPP2	3GPP2 Multimedia File
File extension 3ME	TurboTax Form File
File extension 3MM	3D Movie Maker Movie Project
File extension 3P2	3GPP Multimedia File
File extension 3PE	TurboTax 2008 Form File
File extension 411	Mavica Thumbnail Image
File extension 477	MNS Shape Definition Companion File
File extension 4DB	4th Dimension Database Structure File
File extension 4DD	4th Dimension Database Data File
File extension 4DL	4th Dimension Database Log File
File extension 4DV	4D View Ultrasound File
File extension 4FS	Puppy Linux Save State File
File extension 4MP	4-MP3 Database File
File extension 4UI	ForeUI Plot File
File extension 555	Black & White Weather Settings File
File extension 60D	CCTV Video Clip
File extension 669	8 channels MOD 669 module
File extension 6CM	Six Channel Module
File extension 73B	TI-73 Backup File
File extension 73C	TI-73 Constant File
File extension 73I	TI-73 Screenshot File
File extension 73K	TI-73 Application
File extension 73L	TI-73 Data List File
File extension 73U	TI-73 Explorer Operating System File
File extension 787	AVTECH CCTV Video File
File extension 7Z	7-Zip Compressed File
File extension 7Z001	7-Zip Split Archive Part 1 File
File extension 7Z002	7-Zip Split Archive Part 2 File
File extension 83P	TI-83 Calculator File
File extension 890	Cavena Subtitles File
File extension 89K	TI-89 Application
File extension 8BA	Photoshop Plug-in
File extension 8BC	Photoshop 5.0 Plug-in
File extension 8BE	Adobe Plug-in filter file
File extension 8BF	Filter Factory Image Filter
File extension 8BI	Photoshop Plug-in
File extension 8BI8	Photoshop Plug-in
File extension 8BL	Photoshop Plug-in
File extension 8BS	Photoshop 5.0 Selection Plug-in
File extension 8BX	PhotoDeluxe Plug-in
File extension 8BY	PhotoDeluxe Plug-in
File extension 8CM	Triton FastTracker 8 channel music module file
File extension 8LD	Overlord 2 Language File
File extension 8LI	Photoshop Scripting Plug-in
File extension 8MED	Amiga OctaMed Music File
File extension 8PBS	Adobe Photoshop Macintosh File
File extension 8ST	8start Launcher File
File extension 8SVX	Amiga 8-Bit Sound File
File extension 8XG	TI-83/84 Plus Group File
File extension 8XI	TI-83/84 Plus Picture File
File extension 8XK	TI-83 Plus Application Upgrade File
File extension 8XP	TI-83 Plus Calculator File
File extension 8XS	TI-83/84 Plus String File
File extension 8XU	TI-83 Plus Operating System File
File extension 8XV	TI-83/84 Plus Variable File
File extension 9PNG	NinePatchDrawable Image