File Type 1 Macintosh Disk Image IconMacintosh Disk Image
File Format Standard (developed by Apple)
Usage Open manually; may run a program or script when opened
Popularity ★ ★ ★ ★ ☆  Common

Can be mounted like an optical disc (such as a CD or DVD) or a disk drive (like an external hard drive); resides on the hard drive, but is recognized by the computer as a disc or hard disk when mounted.

IMG files, which were used by Mac OS 9 and earlier versions of the Mac OS, were replaced by the newer .DMG disk image format in Mac OS X.

Important: In some cases, renaming the file extension of an IMG file from ".img" to ".iso" will allow other programs to open the file.

Open With

IconApple Disk Utility

IconRoxio Toast

Published 2007
File Type 2 Disc Image Data File IconDisc Image Data File
File Format Standard
Usage Open manually
Popularity ★ ★ ★ ★ ★  Popular

Contains data copied from a CD by CloneCD; typically used for making backup copies of discs; should be saved in the same folder as the .CCD and .SUB files, which are referenced when burning a new CD.

Open With

IconHH Software Virtual CD

IconLightning UK ImgBurn

IconSmart Projects IsoBuster

Published September 17, 2007
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Information from the PC File Extensions Reference