FileInfo.com


.DMG File Extension


File Type Mac OS X Disk Image
File Format File
Common? No
File Description Mountable disk image created in Mac OS X; commonly used for Mac OS software installers downloaded from the Internet; opening the image file will mount a virtual disk on the desktop.

The DMG format replaces the .IMG file format used in Mac OS Classic and is not compatible with Mac OS 9 and earlier; DMG disk images can be opened on Macintosh computers using Apple Disk Utility, which is bundled with Mac OS X.

DMG files are Mac-specific and are not meant to be opened on Windows; however, Daemon Tools may be able to mount some DMG images files as virtual drives; other utilities may be able to convert DMG files to a more standard format that can be recognized by Windows.
Program(s) that open dmg files Mac: Apple Disk Utility; Roxio Toast; Dare to be Creative iArchiver
Windows: Acute Systems TransMac; DMG2IMG; DMG2ISO

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/dmg