Open/Extract DMG File with Freeware on Windows/Mac/Linux
Apple disk images allow secure password protection as well as file compression and hence serves both security and file distribution functions; they are most commonly used to distribute software over the Internet.
Universal Disk Image Format (UDIF) is the native disk image format for Mac OS X. Disk images in this format typically have a .dmg extension. New Disk Image Format (NDIF) was the previous default disk image format in Mac OS 9, and disk images with this format generally have a .img (not to be confused with raw .img disk image files) or .smi file extension. Files with the .smi extension are actually applications that mount an embedded disk image, thus a "Self Mounting Image", and are intended only for Mac OS 9 and earlier. A previous version of the format, intended only for floppy disk images, is usually referred to as "Disk Copy 4.2" format, after the version of the Disk Copy utility that was used to handle these images. A similar format that supported compression of floppy disk images is called DART. Apple disk image files are published with a MIME type of application/x-apple-diskimage. Different file systems can be contained inside these disk images, and there is also support for creating hybrid optical media images that contain multiple file systems. Some of the file systems supported include Hierarchical File System (HFS), HFS Plus, File Allocation Table (FAT), ISO9660 and Universal Disk Format (UDF). Open/Extract DMG File on WindowsEasy 7-Zip opens/extracts DMG file easily on Windows. The Easy 7-Zip was developed based on 7-Zip. 7-Zip is a famous open source file archiver. The Easy 7-Zip is an easy-to-use version of 7-Zip. The open source freeware keeps all features of 7-Zip and adds a few useful features that makes the software more user-friendly. Easy 7-Zip works on Windows 10/8.1/8/7/Vista/2008/2003/XP/2000 (both 32-bit and 64-bit compatible).
 You will see files or folders within the DMG file then, click button Extract to extract the DMG file.  And then, choose Extract files..., Extract Here, or Extract to "folder\" to extract the DMG file.
Easy 7-Zip Download Links:
You can install and use other alternative freeware that opens/extracts DMG file without burning the DMG file to disc. For example:
Open/Extract DMG File on MacB1 Free Archiver opens/extracts DMG file on Mac. B1 Free Archiver is a free software for creating archive folder and extracting archive file. B1 Archiver works on all platforms - Windows, Linux, Mac and Android. The freeware supports most popular formats including DMG. B1 Free Archiver is compatible with:
Alternative freeware that opens/extracts DMG file on Mac.
Open/Extract DMG File on LinuxYou can use command mount to mount DMG file as a virtual drive. First, you must login as a root user, and then create a directory for DMG image
Use mount command as follows to mount DMG file called image.dmg:
If the DMG is HFS file system, use:
Change directory to list files stored inside an DMG image:
Unmount the DMG image, type:
Alternatively, you can use p7zip to extract the DMG file. p7zip is the Unix command-line port of 7-Zip, a file archiver that archives with high compression ratios. Install p7zip-full on CentOS and Fedora
Install p7zip-full on Debian and Ubuntu
List directories and files in DMG file
Extract DMG file on Linux
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DMG
is a file of Apple Disk Image. The Apple Disk Images are disk image files commonly used by the Mac OS X operating
system. When opened, an Apple disk image is "mounted" as a volume within
the Finder. Several Apple proprietary disk image formats can be used to create
these images, including the Universal Disk Image Format (UDIF) and the New Disk
Image Format (NDIF). Apple disk images usually have the .dmg file extension.