Alphabetically: I
Extension File Description File Type
.i
Visual Studio Intermediate File
Developer
.i00
DVD Shrink Part 1 File
Disk Image
.i01
DVD Shrink Part 2 File
Disk Image
.i02
DVD Shrink Part 3 File
Disk Image
.i5z
IUCLID 5 Import/Export File
Data
.iaf
Outlook Internet Account File
Settings
.iam
Inventor Assembly File
CAD
.ib
InterBase Database
Database
.ibcd
InstantBingoCard Document
Data
.ibp
IsoBuster Managed Image Information File
Disk Image
.ibplugin
Interface Builder Plug-in
Plugin
.ibq
IsoBuster Managed Image File
Disk Image
.ibt
Texture and Model File
Game
.ic1
Low Resolution Imagic Graphics File
Raster Image
.ic2
Medium Resolution Imagic Graphics File
Raster Image
.ic3
High Resolution Imagic Graphics File
Raster Image
.ica
Citrix ICA File
Settings
.icalevent
iCal Event File
Data
.icaltodo
iCal To Do File
Data
.icap
InCopy Package File
Layout
.icb
Targa ICB Bitmap Image
Raster Image
.icbu
iCal Backup File
Backup
.icc
ICC Profile
Settings
.icd
Installable Client Driver File
Settings
.ice
ICE File Archive
Compressed
.icl
Windows Icon Library File
System
.icm
Image Color Matching Profile
Settings
.icma
InCopy Assignment File
Misc
.icml
InCopy Document
Layout
.icn
Windows Icon File
Raster Image
.icns
Mac OS X Icon Resource File
System
.ico
Icon File
System
.icon
Icon Image File
Raster Image
.iconpackage
IconPackager Theme File
Settings
.icontainer
CandyBar iContainer File
Misc
.ics
iCalendar File
Data
.icursorfx
iCursor Effect File
Settings
.id
Lotus Notes User ID File
Misc
.id2
Windows Live Messenger Emoticon File
Data
.idap
Adobe InDesign Assignment Package
Layout
.idb
Visual Studio Intermediate Debug File
Developer
.idc
Internet Database Connector File
Web
.idf
MIDI Instrument Definition File
Settings
.idl
Interface Definition Language File
Developer
.idlk
Adobe InDesign Lock File
Misc
.idml
Adobe InDesign Markup Language File
Layout
.idms
Adobe InDesign Snippet
Layout
.idpk
Adobe InDesign Package for GoLive File
Layout
.idpp
Adobe InDesign Preflight Profile
Settings
.idw
Inventor Drawing
CAD
.idx
Movie Subtitle File
Misc
.idx0
Runescape Cache Index File
Game
.idx255
Runescape Cache File
Game
.ies
IES Photometric Data File
Data
.if
Procedimientos-Uno IFWin Project File
CAD
.ifc
Industry Foundation Classes File
3D Image
.iff
Interchange File Format
Audio
.ifo
DVD-Video Disc Information File
Video
.igc
Anime List Builder Input File
Data
.iges
IGES File
3D Image
.igr
Quest3D Channel Group Layout File
Settings
.igs
IGES Drawing File
CAD
.ihw
IN-HEH Timeline Workspace
Settings
.ihx
IN-HEH Timeline Database
Database
.ii
IconWorkshop Extended Information File
Data
.iif
Intuit Interchange Format File
Data
.iil
CleanSweep Installation Log
Text
.iim
iMacro Macro File
Executable
.iip
ThinAnywhere Configuration File
Settings
.iit
Install Creator Settings File
Settings
.iix
Translation Memory Index File
Misc
.ilbm
Interleaved Bitmap Image
Raster Image
.ildoc
QuickSilver Document
Layout
.ima
Disk Image
Disk Image
.image
Apple Disk Image
Disk Image
.imapmbox
IMAP Mailbox
Text
.imf
Id Music File
Audio
.img
Macintosh Disk Image
Disk Image
.imga
Aleph One Image File
Game
.imi
Magellan Map File
GIS
.imj
JFIF Bitmap Image
Raster Image
.iml
IntelliJ IDEA Module
Developer
.imovieproj
iMovie Project File
Video
.imovieproject
iMovie Project
Video
.imp
Audition Impulse File
Audio
.imt
My Time Data File
Data
.imy
iMelody Ringtone File
Misc
.in
Spyware File
Misc
.inc
Include File
Developer
.inca
InCopy CS3 Assignment File
Misc
.incd
InCopy Document
Layout
.incp
InCopy CS3 Package File
Data
.inct
InCopy Template
Layout
.incx
InCopy CS3 Interchange File
Layout
.ind
Adobe InDesign Document
Layout
.indb
Adobe InDesign Book File
Layout
.indd
Adobe InDesign Document
Layout
.indk
Adobe InDesign Shortcut Set File
Misc
.indl
Adobe InDesign Library
Layout
.indp
Adobe InDesign CS3 Package File
Layout
.inds
Adobe InDesign Snippet File
Layout
.indt
Adobe InDesign Template
Layout
.inetloc
Internet Location
Misc
.inf
Setup Information File
Settings
.info
ZoomBrowser Image Index File
Raster Image
.ing
MasterCook Ingredients File
Misc
.ini
Windows Initialization File
Settings
.ink
Pantone Reference File
Raster Image
.inl
C++ Inline File
Developer
.inlk
Adobe InDesign Lock File
Misc
.inm
FaxMaster Document
Misc
.inms
Adobe InDesign Menu Set File
Settings
.inp
ABAQUS Input File
Data
.ins
Internet Naming Service File
System
.int
SGI Integer Image
Raster Image
.inv
INVedit File
Game
.inx
Adobe InDesign Interchange File
Layout
.ion
4DOS File Description
System
.ip
IconPackager Theme File
Data
.ipa
iPhone or iPod Touch Application
Executable
.ipd
BlackBerry Backup File
Backup
.ipf
SMS Installer Script
Executable
.ipg
iPod Game File
Compressed
.ipk
Itsy Package
Compressed
.ipmeta
Apple iPhoto Metadata File
Data
.ipn
Inventor Presentation File
CAD
.ipp
Inline Guard Macro File
Developer
.ipr
InstallShield Professional Project File
Developer
.iproject
iClone Project File
Data
.ips
Internal Patching System Patch File
Game
.ipsw
iPod and iPhone Software Update File
Misc
.ipt
Inventor Part File
CAD
.iptheme
IconPackager Raw Theme File
Settings
.ipx
IPIX Image
Raster Image
.iqy
Internet Query
Web
.irock
intelliRock Sensor Data File
Data
.iros
Adobe Save For Web Settings File
Settings
.irp
Internet Researcher Project File
Data
.irr
Brewer Lamp File
Data
.irs
Adobe Save For Web Settings
Settings
.irx
Brewer Irradiation File
Data
.is1
M3 Sakura Real-Time Save 1 File
Data
.isc
Xilinx Device Configuration File
Developer
.isd
Flexera InstallShield Dialog Box File
Layout
.ise
InstallShield Express Project File
Developer
.isf
Inspiration Flowchart Document
Data
.ish
ISH Compressed Archive
Compressed
.ish1
Animation-ish Wiggledoodle-ish Document
Data
.ish2
Animation-ish FlipBook-ish Document
Data
.ish3
Animation-ish Advanced-ish Document
Data
.ism
InstallShield Project File
Developer
.isn
Installer Source Files
Misc
.iso
Disc Image File
Disk Image
.isp
IIS Internet Service Provider Settings
Settings
.isr
GoMoku Game File
Game
.iss
InstallShield Silent Response File
Settings
.ist
InstallShield Project Template File
Developer
.isu
InstallShield Uninstaller Script
Executable
.isz
Zipped ISO Disk Image
Disk Image
.it
Impulse Tracker Module
Audio
.ita
IconTweaker Theme Archive
Compressed
.itc
iTunes Cover Flow Data File
Misc
.itc2
iTunes Cover Flow Data File 2
Raster Image
.itdb
iTunes Database File
Database
.ite
iTunes Extras File
Data
.ithmb
iPod and iPhone Photo Thumbnails File
Raster Image
.iti
Impulse Tracker Instrument
Audio
.itl
iTunes Library File
Data
.itlp
iTunes LP Album File
Data
.itm
iThink Model File
Data
.itms
iTunes Music Store Link File
Web
.itn
TomTom Navigator Itinerary File
Data
.itpc
iTunes Podcast Link File
Web
.its
Internet Document Set
System
.itt
IconTweaker Theme File
Settings
.itw
InTouch With Database File
Database
.itx
ITX Form Template
Data
.iup
Fritz Update File
Data
.iv
Open Inventor Scene Graph File
3D Image
.iv2i
Norton Ghost Incremental Virtual Volume Image
Backup
.iva
Surveillance Video File
Video
.ivc
InteliSea Vessel Configuration File
Data
.ive
OpenSceneGraph Binary File
3D Image
.ivf
Indeo Video Format File
Video
.ivr
Internet Video Recording
Video
.ivs
Internet Streaming Video
Video
.ivt
Beyond 20/20 Table
Data
.iw
Chain Engineering Database File
Data
.iwd
Call of Duty Game Data File
Game
.iws
InstallWatch Scan File
Misc
.iwz
InstallShield Express 2 Project File
Developer
.ix
dtSearch Index File
Settings
.ix2
WordPerfect Address Book File
Data
.ixa
Ulead Disc Image format
Disk Image
.ixb
Ulead Disc Image
Data
.izz
Isadora Media Control Project
Video
.izzy
Isadora Project
Video