macOS
Executables & InstallersDMG is a Mac disk image. Opening mounts its contents; installation and execution are separate. It may contain general data or be encrypted, not just distribute an app.
- What it is used for
- Distribution of Mac data/applications
- What the file contains
- Binary data
All sections, questions and sources
Content reviewed： · Editor：Kai
Opening steps
Choose your environment or purpose to see its steps.
Menu labels and support vary by app, OS and version. Preserve the original before making changes.
Troubleshooting by symptom
- Damaged image: consider downloading again or verifying with Disk Utility.
- Unsupported app: compare CPU, OS version and application requirements.
- Password requested: check encryption and obtain legitimate access information.
- Contained app fails: mounting success is separate from macOS/CPU support and signature warnings.
- Cannot eject: close applications using the mounted contents first.
- Cannot run on Windows: establish whether it is a macOS distribution and obtain a Windows build.
DMG → extraction of contents
- Open in a compatible environment and copy needed data separately.
- Check whether the receiver supports those files and retain the original DMG.
- Inspect contents and mounting after image conversion; check application OS support separately.
Renaming to ISO/EXE does not make Mac applications runnable on another OS.
Mounting, copying and installing
Opening DMG exposes a mounted volume; it does not necessarily install the app into Applications.
Choose APP copying, PKG installation or document extraction according to publisher instructions.
Source for these steps：Apple · See the contents of a disk image on Mac / Apple · Download apps on your Mac
Image verification versus launch warnings
Image integrity differs from application trust and compatibility. Consult the publisher about warnings.
Verify launching from the installed location before organizing the distribution image.
Source for these steps：Apple · See the contents of a disk image on Mac / Apple · Download apps on your Mac
Related-format differences
| Format | Main role | Selection notes |
|---|---|---|
| DMG | Disk image | Inspect contained app/package |
| APP | macOS application bundle | Inspect OS / CPU support |
| PKG | Installer package | Follow publisher installation instructions |
Handling and security
Use legitimate sources and respect security checks; inspect files inside mounted images too.
Questions and answers
Does opening install it?
Mounting/inspection is separate from installation.
Can extraction make the app run on Windows?
No; extraction does not provide a Mac runtime.
Does ejecting remove an installed app?
Copied applications are separate from the mounted disk.
Does deleting DMG uninstall the app?
An app copied to Applications differs from the DMG; inspect the launch location before organizing files.
Will DMG-to-ISO make the app run on Windows?
Changing an image container does not change application compatibility. Obtain the authorized Windows build.
Format facts: name, steward and MIME type
- Formal name
- Apple disk image
- Steward / specification
- Apple
- MIME type
- Depends on the producer or server; an extension alone does not establish a MIME type.
Primary and official sources
- Platform documentationSee the contents of a disk image on Mac
Instructions for viewing a DMG image.
Apple · Link checked： - Platform documentationDownload apps on your Mac
Explains downloaded Mac apps and installers.
Apple · Link checked： - Software documentation7-Zip — Supported formats
Lists supported archive and disk-image formats.
Igor Pavlov / 7-Zip · Link checked： - Platform documentationSee the contents of a disk image on Mac
Mounting a DMG and inspecting its contents.
Apple · Link checked：