I
Intermediate file (Borland C++)
IAX
Bitmap (IBM Image Acess eXecutive)
IBM
Compressed archive (ARCHDOS, IBM Internal only)
ICA
Citrix file
ICA
Bitmap graphic (Image Object Content Architecture)
ICB
Targa bitmap
ICC
Printer file (Kodak)
ICL
Icon Library (Generic industry standard)
ICM
Image Color Matching profile
ICN
Icon source code
ICO
Icon (Microsoft Windows 3.x)
ID
Disk identification file (Generic)
IDB
Intermediate file (Microsoft Developer)
IDD
MIDI Instrument Definition
IDE
Project file (Borland C++ v4.5)
IDF
MIDI Instrument Definition (Windows 95 required file)
IDIF
Identification file (Netscape saved address book)
IDQ
Data Query (Internet)
IDW
Vector graphic (IntelliDraw)
IDX
Relational database index (Microsoft FoxPro)
IDX
Relational database index (Symantec Q&A)
IDX
Microsoft Outlook Express file
IDX
Index file (Microsoft Clip Gallery v. 1.x)
IDX
Index file (Pro/Engineer)
IFD
Form (JetForm Design)
IFF
Interchange file, (general purpose data storage format))
IFF
Image (Sun TAAC/SDSC Image Tool)
IFO
Digital Video Disk (DVD) datafile
IFO
Graphic object layer data (ImageForge Pro)
IFP
Script file (KnowledgeMan)
IFS
Compressed fractal image (Yuvpak)
IFS
System file (OS/2)
IFS
Create executable library (ImageForge/ImageForge Pro)
IGES
Initial Graphics Exchange Specification (Generic)
IGF
Metafile (Inset Systems)
IIF
Interchange file (QuickBooks for Windows)
ILB
Datafile (Scream Tracker)
ILBM
Bitmap (graphic image)
ILK
Program outline (Microsoft ILink incremental linker)
IM8
Raster graphic (Sun Microsystems)
IMA
Image (WinImage)
IMA
Vector graphic (EGO,Chart)
IMG
Image (GEM)
IMG
Bitmap graphic (Ventura Publisher)
IMP
Spreadsheet (Lotus Improv)
IMQ
Image presentation (ImageQ)
IMS
Create executable library data (IconForge)
IN$
Installation file (HP NewWave)
IN3
Input device driver (Harvard Graphics v3.0)
INB
Test script (Vermont High Test)
INC
Include file (Assembler language or Active Server)
IND
Index (dBase IV)
INF
Information file (Generic)
INF
Type I LaserJet font information file
INF
Install script (Generic)
INI
Initialization file (Generic)
INI
Setup file (MWave DSP synth's mwsynth.ini GM)
INI
Bank setup file (Gravis UltraSound)
INK
Pantone reference fills file (CorelDRAW)
INP
Source code for form, (Oracle,version 3.0 and earlier)
INRS
INRS-Telecommunications audio
INS
Install script (InstallShield)
INS
Sign-up file (X-Internet)
INS
Instrument file (Ensoniq EPS Family)
INS
Sample (Cell/II MAC/PC instruments)
INS
Datafile (Microsoft WordPerfect for Windows)
INS
Installation script (1st Reader)
INS
Instrument music file (Adlib)
INT
Intermediate executable code (Produced when a source program is syntax-checked)
INT
Interfaced units (Borland)
INX
Index file (Foxbase)
IO
Compressed archive (CPIO)
IOB
3D graphics database (TDDD format)
IOC
Organizational chart (Instant ORGcharting!)
IOF
Findit document (Microsoft Findit)
ION
File description (4dos descript.ion)
IPL
Pantone Spot reference pallette (CorelDRAW)
IPS
International patching system binary patch file
IQY
Internet inquiry (Microsoft)
ISO
Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
IRS
Resource file (Microsoft WordPerfect for Windows)
ISD
Spell checker dictionary (RapidFile)
ISH
Compressed archive (ISH)
ISO
ISO (International Standards Organization table, aka: ISO)
ISP
Sign-up file(X-Internet)
IST
Instrument file (Digitaltracker)
ISU
Uninstall script (InstallShield)
IT
Settings file (intalk)
ITF
Interface file (JPI Pascal TopSpeed)
IT
Music module (MOD) (Impulse Tracker)
ITI
Instrument file (Impulse Tracker)
ITS
Sample file (Impulse Tracker)
ITS
Internet document set (possibly a Microsoft file)
IV
Open Inventor file
IVD
Microdata dimension or variable-level file (Beyond 20/20)
IVP
User subset profile (Beyond 20/20)
IVT
Table or aggregate data (Beyond 20/20)
IVX
Microdata directory (Beyond 20/20)
IW
Screensaver (Idlewild)
IW
Presentation flowchart (IconAuthor-HSC Interactive)
IWA
Text file (IBM Writing Assistant)
IWC
Install Watch document
IWM
Start file (IconAuthor)
IWP
Text file (Wang)
IZT
Binary token file (IZT)