File TypeApple Disk Image
| Developer | Apple |
| Popularity | |
| Category | Disk Image Files |
| Format | Binary |
What is a DMG file?
- Sep 21, 2007 How to Install Software from DMG Files on a Mac. 21 September, 2007 by Tom Harrison in mac os x. A.DMG file is a container file commonly used to distribute applications for Mac OS X. Installing software from one of these requires you to mount the image and move its contents to your computer’s “Applications” directory.
- After downloading the Mac OSX SimUText installer file, the DMG fails to mount, or you see a second DMG file including the word, 'Part' Action: The installer DMG file did not fully download, the download was interrupted, or otherwise damaged. Download again and wait for the download to complete before opening the DMG file.
Jan 18, 2017 Similarly you can't convert a dmg to an exe, as a Mac application won't run on Windows natively. Which application is it? There may well be a Mac equivalent version. As suggested above, the only option you have if you don't have a Mac version of the app is to run it virtually.
A DMG file is a mountable disk image used to distribute software to the macOS operating system. The file is typically downloaded from the Internet by a Mac user, then double-clicked to install an application on the computer.
Today, software developers typically build and distribute applications for Mac users as DMG, .APP, or .PKG files. DMG files are especially common since their contents can be verified upon installation to ensure they have not been tampered with and they can also be compressed to reduce the size of the installer.
When a Mac user downloads a DMG file, he can simply double-click it to open it with the DiskImageMounter utility that comes with macOS. When the DMG file is opened, it mounts a virtual disk on the desktop and in an Apple Finder window as if it was a CD or a USB flash drive that was just inserted into the computer.
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In the Finder window, the Mac user can double-click the program icon, which is an APP file, to run the app. Or the Mac user can drag the program icon to the 'Applications' folder icon to move it to the 'Applications' directory in macOS.
After the software stored in the DMG file is installed, the DMG file is no longer needed. Therefore, DMG files can be deleted after installing the software.
While DMG files are Mac-specific and not intended for use in Windows, there are several Windows programs that can extract their contents or convert them to other formats. Some programs include 7-Zip, PeaZip, and DMG2IMG.
NOTE: The DMG format replaced the .IMG file format, which was previously used in Mac OS Classic.
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If an app isn't working as you expect
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After you upgrade macOS, you might find that some third-party apps don't work or act as you expect. An app might not open, run, or install, even if you try to reinstall it.
You might see this issue if:
- Your Mac has software installed on it that's known to be incompatible with your new macOS version. This software is placed in an Incompatible Software folder during the upgrade process.
- Your Mac has software installed on it that conflicts with updates to System Integrity Protection in macOS High Sierra.
Make sure that you have the latest version
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If an app doesn’t work after you upgrade, make sure that you have the latest version:
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- Check for an updated version of the app that is compatible with your new OS. Apps in the Mac App Store list their compatibility and system requirements on their product pages.
- Find out whether the app developer has a new version or plans to release a new version of the app that is compatible with your new OS.