View all extensions

File Extensions

Browse file extensions by category or letter. Learn what each file type is used for and find software that can open, view, edit, or convert it.

10
Indexed file extensions

Find the right information for any file extension

Use this directory to look up file formats, understand what files are used for, and find compatible applications for Windows, macOS, Linux, mobile, and online tools.

Search by extension Enter extensions like PDF, APK, DAT, HEIC, ZIP, or DOCX.
Browse categories Filter by documents, images, videos, archives, data, and more.
Open files safely Check file sources and use trusted software before opening unknown files.

Filter extensions

Refine your search with categories and letters

10 extensions
Data Letter: I Clear all
.IDX

Index File

The IDX file extension is primarily used to denote an index file, which serves as a pointer or metadata repository for a larger data s…

Data
.IFC

Industry Foundation Classes

The IFC (Industry Foundation Classes) file format is an open, international standard for Building Information Modeling (BIM) data. It…

Data
.IGC

International Gliding Commission Flight Data File

The IGC file format is a standardized data format used primarily in the aviation industry, specifically for gliding, paragliding, and…

Data
.IGES

Initial Graphics Exchange Specification

The IGES (Initial Graphics Exchange Specification) file format is a vendor-neutral file format that allows the digital exchange of inf…

Data
.IGES (.IGS, .IGES)

Initial Graphics Exchange Specification

The IGES (Initial Graphics Exchange Specification) file format is a vendor-neutral file format that allows the digital exchange of inf…

Data
.IGS

Initial Graphics Exchange Specification

The IGES (Initial Graphics Exchange Specification) file format, identified by the .igs extension, is a vendor-neutral file format desi…

Data
.IMG

Disk Image File

An IMG file is a disk image, a single file containing the complete structure and contents of a data storage medium, such as a hard dri…

Data
.INF

Setup Information File

An INF file, short for Setup Information file, is a plain text file format used by Microsoft Windows for installing software and hardw…

Data
.ITMT

iTones Music Theme File

The ITMT file extension is a specialized data format primarily associated with iTones, a legacy software utility designed for the crea…

Data
.IVY

Apache Ivy Module Descriptor

The .ivy file is a configuration file used by Apache Ivy, which is a popular dependency manager for Java-based projects, often integra…

Data
.IDX

Index File

The IDX file extension is primarily used to denote an index file, which serves as a pointer or metadata repository for a larger data set. One of its most commo…

Data
.IFC

Industry Foundation Classes

The IFC (Industry Foundation Classes) file format is an open, international standard for Building Information Modeling (BIM) data. It is developed by buildingS…

Data
.IGC

International Gliding Commission Flight Data File

The IGC file format is a standardized data format used primarily in the aviation industry, specifically for gliding, paragliding, and hang gliding. It was deve…

Data
.IGES

Initial Graphics Exchange Specification

The IGES (Initial Graphics Exchange Specification) file format is a vendor-neutral file format that allows the digital exchange of information among Computer-A…

Data
.IGES (.IGS, .IGES)

Initial Graphics Exchange Specification

The IGES (Initial Graphics Exchange Specification) file format is a vendor-neutral file format that allows the digital exchange of information among Computer-A…

Data
.IGS

Initial Graphics Exchange Specification

The IGES (Initial Graphics Exchange Specification) file format, identified by the .igs extension, is a vendor-neutral file format designed for transferring 2D…

Data
.IMG

Disk Image File

An IMG file is a disk image, a single file containing the complete structure and contents of a data storage medium, such as a hard drive, floppy disk, CD-ROM…

Data
.INF

Setup Information File

An INF file, short for Setup Information file, is a plain text file format used by Microsoft Windows for installing software and hardware components. It contai…

Data
.ITMT

iTones Music Theme File

The ITMT file extension is a specialized data format primarily associated with iTones, a legacy software utility designed for the creation and management of cu…

Data
.IVY

Apache Ivy Module Descriptor

The .ivy file is a configuration file used by Apache Ivy, which is a popular dependency manager for Java-based projects, often integrated with Apache Ant. The…

Data

Frequently Asked Questions

Everything you need to know about file extensions

You can search by entering a file extension directly in the search bar or browse the directory by category or alphabetical index.

Each listing provides a definition of the file extension, common use cases, compatible software, supported platforms, and related or alternative formats.

The database is updated regularly to reflect new file extensions, changes in software compatibility, and evolving file format standards.