DMG files are Mac-only by default, but Windows can open them with the right tool

A DMG file is a disk image created on Apple computers — think of it as a container that holds files or software. Windows does not recognize DMG files natively, so double-clicking one does nothing. You have three realistic paths: convert the DMG to a format Windows understands, use third-party software designed to read DMG files, or extract the contents if you only need what is inside.

The best choice depends on what you are trying to do. If someone sent you a DMG file containing documents or photos, extraction is fastest. If you need to run Mac software, you cannot — that software will not work on Windows no matter what format it is in. If you have a DMG installer for something that also exists for Windows, download the Windows version instead.

Key Takeaways

  • Windows does not open DMG files directly; you need either conversion software, extraction tools, or a third-party reader.
  • 7-Zip and WinRAR can extract files from many DMG files without installing additional software, though some encrypted DMGs will not work.
  • If the DMG contains a Mac application, it cannot run on Windows — you will need the Windows version of that software instead.
  • Online conversion tools can turn a DMG into an ISO file that Windows can mount, but upload your file only to services you trust.
  • The fastest solution is often to ask the person who sent you the file for a Windows version or a different format.

Extract files using 7-Zip or WinRAR

The simplest approach for most DMG files is to treat them like a compressed archive. 7-Zip and WinRAR are both free or low-cost tools that can read inside many DMG files and pull out the contents without converting anything.

Download and install 7-Zip (it is free) or WinRAR (free trial, paid license after 40 days). Right-click the DMG file, select "Open with 7-Zip" or "Open with WinRAR", and you will see a folder view of what is inside. Drag the files you need to a folder on your computer. This works for most DMG files that contain documents, images, or other data.

This method fails on encrypted DMG files or those with special Mac-only compression. If you right-click and neither tool appears in the menu, or if the archive opens but shows only garbled names, move to the conversion method instead.

Convert DMG to ISO using online tools

An ISO file is a disk image format that Windows recognizes. You can convert a DMG to ISO using an online converter, then mount the ISO file directly in Windows without installing anything extra.

Go to a converter site like CloudConvert, Zamzar, or Online-Convert. Upload your DMG file, select ISO as the output format, and download the converted file. This usually takes a few minutes. Once you have the ISO, right-click it in Windows File Explorer, select "Mount", and Windows will treat it like a disk drive you can open and copy files from.

The trade-off is that you are uploading your file to a third-party server. Only use this method for files that do not contain sensitive information, and choose a converter with a clear privacy policy. If the file is large or contains private data, use 7-Zip extraction instead.

Install dedicated DMG reader software

If you work with DMG files regularly, a dedicated reader saves time. TransMac is the most common option — it costs around $50 but includes a 15-day free trial. It can open, extract, and convert DMG files without uploading anything to the internet.

Download and install TransMac, then right-click any DMG file and select "Open with TransMac". You will see the contents in a window and can extract files by dragging them out. TransMac also handles encrypted and compressed DMGs that 7-Zip cannot read.

For occasional use, the free extraction method is usually enough. Buy TransMac only if you receive DMG files weekly or more often.

What to do if the DMG contains Mac software

If the DMG holds a Mac application (usually a .app file), opening it in Windows will not help. Mac software is compiled to run on Apple processors and operating systems. Windows cannot execute it, no matter what format the file is in.

Your options are to find a Windows version of the same software, use a web-based alternative that works in any browser, or ask the person who sent it whether they have a Windows installer. Many popular programs like Microsoft Office, Adobe Creative Suite, and Slack have Windows versions. If it is niche software, search the developer's website for a Windows download.

Ask for a different file format

Before spending time on conversion, ask the person who sent you the DMG whether they can resend it as a ZIP file, RAR file, or in whatever format they used on their Mac. Many people do not realize DMG is Mac-specific and will happily send a Windows-compatible version if you ask.

This is especially true if the file contains documents, photos, or other data rather than software. A ZIP file works on both Mac and Windows and requires no special tools to open — Windows File Explorer handles it natively.

Frequently Asked Questions

Can I run Mac software inside Windows using a DMG file?

No. A DMG file is just a container — the software inside is still Mac software. You cannot run Mac applications on Windows, even with conversion tools or virtual machines designed for home use. You need the Windows version of the software, or a different program that does the same thing on Windows.

Is it safe to use online DMG converters?

Online converters are generally safe for files that do not contain sensitive information. The conversion itself is straightforward and most services delete uploaded files after a few hours. However, if your DMG contains passwords, financial data, or private documents, use 7-Zip extraction or TransMac instead to keep the file on your computer.

Why does 7-Zip show garbled filenames inside my DMG?

This usually means the DMG uses Mac-specific compression or encryption that 7-Zip cannot fully read. Try TransMac or an online converter instead. If neither works, the file may be corrupted or use a format that Windows tools do not support — ask the sender for a fresh copy or a different format.

Do I need to install anything to open a DMG file?

If you already have 7-Zip or WinRAR installed, no. If not, you can install either one for free (7-Zip) or a free trial (WinRAR). Alternatively, use an online converter and mount the resulting ISO file, which requires no installation. Only TransMac requires a paid purchase for permanent use.

What is the difference between extracting and converting a DMG?

Extracting pulls the files out of the DMG and leaves the container behind. Converting changes the DMG itself into a different format like ISO. Extraction is faster and safer for your data. Conversion is useful if you want to mount the disk image itself in Windows rather than just access the files inside.