File types with extensions that start with a number or symbol

File Extention	File Type	Description
.!bt	Misc	BitTorrent Incomplete Download File
.!qb	Misc	qBittorrent Partial Download File
.!ut	Misc	uTorrent Incomplete Download
.$$$	Backup	Temporary File
.$01	Developer	DOS Pipe File
.$db	Backup	dBASE Temporary File
.$er	Database	GroupWise Database
.0	System	Shared Library Link File
.0	Game	M3 DS Real Save File
.0	Compressed	Hacha Split Archive File
.00	Game	The Ur-Quan Masters Saved Game Slot 0 File
.000	System	Indexing Service Data File
.000	Disk Image	Virtual CD Disc Image File
.000	Misc	Windows CE Installation Data File
.000	Compressed	DoubleSpace Compressed File
.001	Backup	Split Archive File
.001	Backup	Norton Ghost Disk Backup
.001	Game	Snes9x Slot 2 Saved State
.001	Raster Image	Fax File
.001	Developer	Multimedia Fusion Backup File
.002	Backup	Split Archive Part 2 File
.0xe	Executable	F-Secure Renamed Virus File
.1	Misc	Unix Section 1 Man Page
.113	Backup	Iomega Backup File
.123	CAD	PCB123 Circuit Board Design
.123	Spreadsheet	Lotus 1-2-3 Spreadsheet
.123c	CAD	Autodesk 123C Drawing
.123d	CAD	Autodesk 123D Drawing
.123dx	CAD	123D Design Model File
.1pe	Data	TurboTax Form File
.1ph	Data	TurboTax File
.1st	Text	Readme File
.256	Settings	Descent 2 Color Palette File
.264	Video	Ripped Video Data File
.2bp	Raster Image	Pocket PC Bitmap Image File
.2d	CAD	VersaCAD 2D Drawing File
.2fs	System	Puppy Linux Save State File
.2mg	Disk Image	Apple IIGS Disk Image
.2sf	Audio	Nintendo DS Sound File
.2sflib	Audio	Nintendo DS Audio Library File
.323	Misc	H.323 Internet Telephony File
.32x	Game	Sega 32X ROM
.360	Raster Image	360desktop Panorama File
.386	System	Windows Virtual Device Driver
.3d	3D Image	Stereo CAD-3D Image File
.3d	GIS	Survex 3D Cavern File
.3d2	3D Image	Stereo CAD-3D 2.0 Image File
.3d4	3D Image	Stereo CAD-3D 2.0 Image File
.3da	3D Image	3D Assembly File
.3dc	GIS	iGO 3D Building File
.3dc	3D Image	3DCrafter Scene File
.3dc	Misc	RacerMate 3D Course File
.3dc	CAD	RoboCell Cell Setup File
.3dc	3D Image	3DCT 3D Image
.3dd	GIS	ArcGlobe Document
.3df	3D Image	3D Format
.3dl	3D Image	LightConverse 3D Model File
.3dl	GIS	iGO Landmark File
.3dl	CAD	Sierra LandDesigner 3D File
.3dm	3D Image	Rhino 3D Model
.3dmf	3D Image	QuickDraw 3D Metafile
.3dmk	3D Image	123D Make Project File
.3don	3D Image	Scrutinize 3D Mesh File
.3dp	3D Image	123D Catch Photo Scene Data File
.3dp	Data	3DMark2011 SE Project File
.3dr	Data	3DMark Results File
.3dr	Data	3D Rad Project File
.3ds	3D Image	3D Studio Scene
.3ds	Game	Nintendo 3DS ROM
.3dt	Data	3D Topicscape File
.3dv	3D Image	3D VRML World
.3dw	3D Image	3D World Studio File
.3dx	3D Image	Rhino 3D Model File
.3dxml	3D Image	Dassault Systemes 3D XML File
.3fr	Camera Raw	Hasselblad 3F RAW Image
.3fs	System	Puppy Linux Save State File
.3g2	Video	3GPP2 Multimedia File
.3ga	Audio	3GPP Audio File
.3gp	Video	3GPP Multimedia File
.3gp2	Video	3GPP Multimedia File
.3gpp	Video	3GPP Media File
.3gpp2	Video	3GPP2 Multimedia File
.3me	Data	TurboTax Form File
.3mm	Video	3D Movie Maker Movie Project
.3p2	Video	3GPP Multimedia File
.3pe	Data	TurboTax 2008 Form File
.411	Raster Image	Mavica Thumbnail Image
.477	GIS	MNS Shape Definition Companion File
.4db	Developer	4th Dimension Database Structure File
.4dd	Database	4th Dimension Database Data File
.4dl	Database	4th Dimension Database Log File
.4dv	Data	4D View Ultrasound File
.4fs	Data	Puppy Linux Save State File
.4mp	Audio	4-MP3 Database File
.4th	Developer	Forth Language File
.4ui	Page Layout	ForeUI Plot File
.555	Game	Black & White Weather Settings File
.60d	Video	CCTV Video Clip
.669	Audio	UNIS Composer 669 Module
.6cm	Audio	Six Channel Module
.73b	Backup	TI-73 Backup File
.73c	Data	TI-73 Constant File
.73i	Raster Image	TI-73 Screenshot File
.73k	Executable	TI-73 Application
.73l	Data	TI-73 Data List File
.73u	System	TI-73 Explorer Operating System File
.787	Video	AVTECH CCTV Video File
.7z	Compressed	7-Zip Compressed File
.7z.001	Compressed	7-Zip Split Archive Part 1 File
.7z.002	Compressed	7-Zip Split Archive Part 2 File
.83p	Misc	TI-83 Calculator File
.890	Video	Cavena Subtitles File
.89k	Executable	TI-89 Application
.8ba	Plugin	Photoshop Plug-in
.8bc	Plugin	Photoshop 5.0 Plug-in
.8be	Plugin	PhotoDeluxe Plug-in
.8bf	Plugin	Filter Factory Image Filter
.8bf	Plugin	Photoshop Filter Plug-in
.8bi	Plugin	Photoshop Plug-in
.8bi8	Plugin	Photoshop Plug-in
.8bl	Plugin	Photoshop Plug-in
.8bs	Plugin	Photoshop 5.0 Selection Plug-in
.8bx	Plugin	PhotoDeluxe Plug-in
.8by	Plugin	PhotoDeluxe Plug-in
.8cm	Audio	Eight Channel Module
.8ld	Game	Overlord 2 Language File
.8li	Plugin	Photoshop Scripting Plug-in
.8med	Audio	Amiga OctaMed Music File
.8pbs	Raster Image	Adobe Photoshop Macintosh File
.8st	Settings	8start Launcher File
.8svx	Audio	Amiga 8-Bit Sound File
.8xg	Data	TI-83/84 Plus Group File
.8xi	Raster Image	TI-83/84 Plus Picture File
.8xk	Data	TI-83 Plus Application Upgrade File
.8xp	Misc	TI-83 Plus Calculator File
.8xs	Data	TI-83/84 Plus String File
.8xu	System	TI-83 Plus Operating System File
.8xv	Data	TI-83/84 Plus Variable File
.9.png	Raster Image	NinePatchDrawable Image
.^^^	Database	Pervasive.SQL Database File
.__a	Backup	File Splitter & Joiner Encrypted File
.__b	Backup	File Splitter & Joiner Encrypted Archive File
._eml	Misc	Windows Live Mail Email File
._nws	Misc	Windows Live Mail Newsgroup Copy File
._sys.lfo	Misc	Adware File
.{pb	Data	Corel WordPerfect Document Index File
.~cw	Backup	Circuit Wizard Backup File
.~hm	Data	HostMonitor TestList Backup File