Computer file extensions - I

Updated: 06/30/2019 by Computer Hope

Below is a listing of each of the different file extensions that begin with the letter "I." If you are looking for a file extension that starts with a different letter, click the corresponding beginning letter below.

.ICA Citrix file or IOCA graphics file.
.ICB Targa bitmap file.
.ICC Kodak printer image.
.ICE Archive file.
.ICL Icon library file.
.ICM Image Color Matching profile file.
.ICN Microsoft Windows icon manager file.
.ICO 1. Microsoft Windows icon file.
2. Icondraw file.
.ICS Image Cytometry Standard file.
.ID Disk identification file.
.IDB Microsoft developer intermediate file, used with Microsoft Visual Studio.
.IDD MIDI (musical instrument digital interface) instruments definition.
.IDE Integrated Development Environment configuration file.
.IDF MIDI instruments drivers file.
.IDQ Internet data query file.
.IDX Index file.
.IFF 1. IFF/LBM (Amiga) used by Computer Eyes frame grabber.
2. Interchange File Format file.
.IFO DVD (digital versatile disc) information file containing information on the DVD audio, chapters, and subtitles.
.IGS IGES (Initial Graphics Exchange Specification) drawing file, saved using the 2D/3D vector format.
.IMA IMA file format for medical images.
.IMG 1. GEM/IMG and Digital Research file
2. Ventura Publisher bitmap graphic.
.INF Information file with customization options.
.INI Files that initialize Windows and Windows apps.
.INS Index Naming Service file.
.IPA Program file for iPad, iPhone, and other iOS devices.
.IPD Blackberry backup information on PC.
.IPF 1. Installer script file.
2. OS/2 online documentation for Microsoft source files.
.ISO Compressed file used for an exact duplicate of a CD. An .ISO file can be extracted or opened such programs as Win Image. Also, see the ISO image definition for further information and related links.
.IW44 DjVu file.
.IWA IBM Writing Assistant text file.