File extension DMG

File extension DMG is one of the file extensions that define type of the file and its contents.

The files with the .dmg extension are actually the Disk Copy Disk Image Files used by Apple Macintosh OS X . On the Macintosh operating system, they play the same role as a real disk. These files can be burnt to CD or can be played like normal audio files. As far as the Windows users are concerned, they might not come to know the contents of a .dmg file as it only works in the Macintosh Operating System.

A bit more about File extension DMG

There are various disk image formats from Apple which can be used to create the files of the .dmg extension. They include the Universal Disk Image Format (UDIF) and New Disk Image Format (NDIF). These files with the .dmg extension can be kept very safely as the Apple Macintosh OS X allows to secure them with password protection. The distribution of these files is also extremely easy as the option of compression is also available with these files. As far as the Apple Operating Systems are concerned, then these are the most common files to collect and transfer data from one user to the other.

So, how can you access this type of file?

For the time being, the only way of accessing the File extension DMG disk image files in Macintosh is by using the developer version of the Disk Copy (version 6.4) or by using the beta copy of the version 6.5 which is unreleased currently. But, even with these, there is a limitation that they can only open those disk image files which are not compressed in nature. The compressed disk image files with the File extension DMGcan still not be opened and accessed through Apple Macintosh.

There are a few licensed programs which can be used by the Non-Macintosh users to gain access to the .dmg disk image files. They are dmg2img, DMGEXtractor, Peazip and 7Zip. In the Windows operating system, most of these files can be accessed with programs like Acute Systems TransMac, HFSExplorer, 7-zip, UltraSO and IsoBuster. TransMac provides the facility to both create and open the DMG files on the system. While the programs like IsoBuster have the capability to interpret these files directly from their source. Thus, they can be very efficient and helpful, especially for the Non-Macintosh users.

Confused about File extension DMG? Want to learn more about what file extensions are, how Windows and computers work? You can start by reading our knowledge base articles about these topics in our knowledge base which is regularly updated with new content.

Files on computers are grouped together into folders. Folders can contain files or other folders within them. Folders help keeps your computer files organized. Learn more about files and folders.

Files can contain different kinds of information – text documents, spreadsheets with numbers, pictures, videos, music, maps, etc… In order to tell which file contains which data, file extensions are used. File extension is a part of a file name that comes after the last dot. Examples of file extensions are JPEG, DOC, MP3, MP4, etc. A rough analogy would be person’s last name. Just like it, file extension identifies which “family” of files, specific file belongs to. Learn more about file extensions.

From computer’s point of view all files contain just long strings of numbers. It is computer applications (aka software) is what translates these numbers into useful, text images, and sounds. In order to open the file correctly, computer must use correct application that is appropriate for a file type (Word processor for text documents, photo application for image files, etc). Each file extension is assigned main default application that opens it and a number or additional applications that user can choose from. Information about these assignments is stored in Windows Registry. Failure to open files often results from Windows registry being corrupted. Learn more about Windows Registry.

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