File extensions beginning with i

File Extension Description
I Preprocessor output file
IAK Internet Access Kit
IAM Assembly file
IAX Bitmap graphics (IBM Image Access eXecutive)
IAX data
IBG PDS graphic file
IBM Archive (Internal IBM only)
ICA Bitmap graphics (Image Object Content Architecture)
ICB Bitmap graphics
ICC ICC configuration
ICE Archive
ICM ICC configuration
ICN ICON source code file
ICO Icon file
ID Disk identification file
IDB IDA database
IDB VC++ Minimum Rebuild Dependency File
IDC IDA C language source
IDE Borland C++ 4.x IDE project
IDF MIDI instrument description
IDS IDA imported names format
IDW Vector graphics
IDW Drawing file
IDX Index
IFD Form
IFF Interchange Format File (IFF)
IFF Sun TAAC Image File Format
IFP Script
IFS Fractal image compressed file
IFS Iterated fractal system file
IFS Installable file system
IGC Flight tracks downloaded from GPS devices in the International Gliding Commission's prescribed format
IGES Initial Graphics Exchange Specification
IGF Inset Systems
IHP Watcom help file
IHS Inbound History
IIW Power Point Image Importer Wizard
IL hDC Designer Icon Lin dll format
ILB Data
ILG data
ILK Outline of program's format
IM Auran Jet indexed mesh file
IM8 Sun raster graphics file
IMA Mirage vector graphics
IMG ADEX graphic file
IMG Disk Image
IMG GEM bitmapped graphics file
IMG Image for Windows/Image for DOS Disk image
IMG Vivid IMG file
IMI image
IMI image
IMP Spreadsheet
IMQ Image presentation
IN$ Installation file
IN3 Input device driver
INB Test script
INC Include file
IND Data Index
INDD InDesign Document
INF Information text file (ASCII)
INF Install script
INF OS/2 hypertext help system file
INF Type 1 LaserJet font information file
INFO GNU info reader (output from texinfo)
INFO Icon Data (Amiga)
INGR Intergraph Raster File Format
INI Initialization file
INK Pantone reference fills file
INS Data
INS Ensoniq Instrument File
INS Installation script
INS Instrument music file (Adlib)
INT Borland Interface Units
INT Program saved in Internal (semi-compiled) format
INT Source of Borland interface module
INX Index
IO Archive
IOB 3d graphics database in TDDD format
IOC Organizational chart
ION 4DOS descript.ion file (file descriptions)
IP Immortal Player file
IPC Intellitec Program Configuration - used to configure vehicle electronics
IPF Interchangeable Preservation Format
IPG iPod game file
IPH Hi-Res Image
IPL Pantone Spot reference palette file
IPN Intecplan project
IPS IPS Patching Format (International Patching System)
IPT Part file
IPT MultiColor Image
IRS Resource (WordPerfect) standard.irs
IRT Data
IRTR Graphicon-2000 Interactive Real-Time PHIGS
ISD Spelling Checker dictionary
ISH Archive
ISMA Output Video file
ISO ISO-9660 table
IST Digitrakker Instrument File
IT Impulse Tracker music file
IT Settings
ITF Interface file
ITL iTunes music library
ITN Itinerary file
ITT IconTweaker Theme
IV SGI Inventor
IV-VRML Inventor VRML Format
IVE OpenSceneGraph 3D model
IVI Image file
IVL Lensflare file
IVP Panorama file
IVU User Interface file
IW Presentation flowchart
IWA Text file
IWB Information WorkBench
IWD Call of Duty Map - Game Data Archive
IWP Text file
IX data
IZT Izl binary token file