Filename Extensions

Select the initial letter:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1-9, #$?

Letter I

Ext.	Description
I	Phase Vocorder analysis data
I	Preprocessor output file (Borland C Preprocessor)
I	Header File Assembler
I3	Interface source (Modula-3)
IAX	Bitmap image (IBM Image Access eXecutive file)
IBG	Planetary images by NASA (PDS format)
IBM	Commodore Amiga graphics
IBM	Compressed file archive (Internal IBM only) (ARCHDOS)
IC	M3CG intermediate language file (Modula-3)
IC1	Bitmap image (Atari Image)
IC2	Bitmap image (Atari Image)
IC3	Bitmap image (Atari Image)
ICA	IoCA ICon Archive (Image Object Content Architecture)
ICA	Citrix file
ICB	Truevision Targa bitmap image
ICC	Bitmap image (Kodak ICC printer file)
ICE	Lempel Ziv Huffman archive
ICE	Cooltalk audio?
ICL	Inon library
ICM	ICC Printer/Monitor profile
ICN	Icon Resource (RIP icon)
ICN	Icon language source code file
ICO	Windows 3.x/95/NT ICOn Resource
ICON	Icon image (1bit) (Sun icon file) (Unix)
ICP	IContact Parameter file (Unix)
ICR	Bitmap image (NCSA Telnet Interactive Color Raster graphic file)
ID	Disk identification file
IDB	IDA database
IDC	Bitmap image (Core Software Tech CORE IDC file)
IDC	Document (Internet Database Connector)
IDC	IDA C language source code file
IDD	MIDI Instrument Definition
IDE	Project (Borland C++ 4.x)
IDF	MIDI-instrument definition
IDF	Instruments drivers file
IDL	Visual C++ interface definition file
IDS	Imported names format (IDA)
IDW	IntelliDraw vector image
IDX	Index file
IDX	Header information (CMYK image) (Stork format)
IDX	Datenbank Index (Foxpro)
IDX	FIBU data file
IE?	PCTools Backup settings
IEF	Bitmap image (Image Exchange Format)
IFD	Form (JetForm Design)
IFF	Bitmap image
IFF	Sound (Amiga IFF/8SVX Audio Interchange File Format)
IFF	TDI Explore & Alias Wavefront image
IFF	DESR VFF greyscale bitmap image
IFP	KnowledgeMan script
IFS	YuvPak fractal image compressed file
IFS	Installable File System (OS/2)
IFS	Iterated Function System fractal (Fractint)
IG	Modula-3 generic interface source
IGES	2D or 3D CAD model (Initial Graphics Exchange Specification format)
IGF	Inset Systems metafile
IGS	2D or 3D CAD model (Initial Graphics Exchange Specification format)
IHP	Watcom help file
IHS	Inbound History (Bink/+)
II	Preprocessed C++ source code (gcc)
IIF	QuickBooks for Windows interchange file
III	Intel IPhone-compatible
IKO	Windows Icon Resource
IL	hDC Designer Icon Library (=DLL)
IL	Inline expansion file (Fortran 90)
ILB	Scream Tracker data
ILBM	Bitmap image (Amiga Interleaved BitMap format)
ILK	Outline of program's format (incremental linker) (Ms ILink)
IM	AIM Grey Scale image
IM	Bitmap image (Sun raster file)
IM1	Bitmap image (1bit) (Sun raster file)
IM24	Bitmap image (24bit) (Sun raster file)
IM32	Bitmap image (32bit) (Sun raster file)
IM8	Bitmap image (8bit) (Sun raster file)
IM8	Sun Raster Grafik
IMA	AIM Grey Scale image?
IMA	Image (WinImage)
IMA	Mirage vector image (EGO/Chart/Autumn)
IMAGE	Disk image (Disk Copy/ShrinkWrap)
IMG	Bitmap image, GEM Paint/Ventura
IMG	Vivid image
IMG	Disk image (Disk Copy/ShrinkWrap)
IMP	Lotus IMProv Spreadsheet
IMP	Compressed file archive (IMP)
IMP	Pascal implementation
IMQ	ImageQ image presentation
IMQ	Planetary images by NASA (PDS format)
IN	INput
IN$	Installation file (HP NewWave)
IN3	Harvard Graphics 3.0 input device driver
INB	Test script (Vermont HighTest)
INC	INClude file (several programming languages)
IND	dBASE IV data index
INF	Setup INFormation used in Windows
INF	Hypertext help system file (OS/2)
INFO	GNU info reader (output from texinfo) (unix)
INFO	Amiga icon data
INGR	Intergraph Raster File Format
INI	INItialisation file used in Dos and Windows
INK	Pantone reference fills file (CorelDraw)
INL	C++ INLine function implementation
INN	Micro Focus COBOL/2 overlay
INS	Often used as INStallation file
INS	Internet Communication Settings (MS IIS)
INS	Adlib/Ensoniq INStrument file
INS	WordPerfect datafile
INT	Borland INTerface module source
INT	Signature/Micro Focus COBOL/2 INTermediate code (semi-compiled)
INT	FoxPro Code page file, collation sequence
INX	Foxbase INdeX
IO	CPIO compressed file archive
IO	Modula-3 object file
IOB	3D object, Imagine 1, 2 or Turbo Silver
IOC	Instant ORGcharting! organizational chart
ION	As 'Descript.ion' a small textfile (file descriptions) (4DOS)
IP	Interactive Physics data
IP	Inspection Procedures (NRC Inspection Manual)
IPL	Pantone Spot reference palette file (CorelDraw)
IPS	IPScript (IPIX)
IPX	Ipix Spherical panorama
IQY	MS Excel web query file
IRC	Sound (IRCAM format)
IRIS	Silicon Graphics Raw Red, Green and Blue bytes image, see .RGB
IRS	WordPerfect resource
IRTP	Image (Graphicon-2000 Interactive Real-Time PHIGS)
IS	Modula-3 intermediate assembly file
ISD	RapidFile spelling checker dictionary
ISH	Image Speeder Image
ISH	Compressed file archive (ISH)
ISO	Easy CD Creator CD image file
ISO	ISO-9660 table
ISP	Internet Service Provider settings (Ms IIS)
ISU	Windows uninstall script by Stirling Technologies
IT	Impulse Tracker music
IT	Settings (intalk)
ITA	ITAlian documentation
ITF	InTerFace file (JPI TopSpeed Pascal)
ITS	Internet Document Set
IV	Inventor VRML Format by Silicon Graphics
IVA	Surveillance Video File
IVA	Dementia.4207 Virus File
IVB	Bitmap image (Truevision Targa format)
IVF	Indeo Video
IVR	Virtual reality world (live picture)
IVT	InfoViewer information title
IVUE	Live Picture multi-view format
IV-VRML	Inventor VRML Format document
IW	Presentation flowchart (IconAuthor/HSC InterActive)
IW	Idlewild screensaver
IW44	DjVu image
IWA	IBM Writing Assistant text document
IWP	Wang text document
IX	Modula-3 linker information
IZT	Binary token file (IZL)

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