What an ISO file is and why you can't open it like a regular file

An ISO file is a single compressed container that holds an exact copy of a disc — a CD, DVD, or Blu-ray. It bundles together every file, folder, and bit of disc structure into one package. Your computer does not recognize it as a folder you can click into, the way it treats a regular folder on your desktop. Instead, you need to either mount it (make your operating system treat it temporarily like a real disc) or extract its contents to a regular folder.

The reason ISO files exist is straightforward: they let you share or store an entire disc without owning the physical disc. Software publishers, Linux distributions, and game companies all ship ISO files so you can install or run their products. But because an ISO is not a standard folder, your computer needs a tool to read it.

The good news is that every major operating system has built-in tools for this, and the process takes less than a minute once you know which button to click.

Key Takeaways

  • Windows 10 and later can mount ISO files directly by right-clicking and selecting "Mount" — no extra software needed.
  • Mac users can double-click an ISO file and it will mount automatically, appearing as a disc on the desktop.
  • Linux users can mount an ISO from the terminal using the mount command, or use a file manager with built-in ISO support.
  • Extracting an ISO (rather than mounting it) creates a regular folder with all the files inside, which works if you only need to read the contents once.
  • If you want to burn an ISO to a physical disc, that requires different software than opening it.

Opening an ISO on Windows 10 or later

Windows 10 and all newer versions include built-in ISO mounting. Find the ISO file on your computer, right-click it, and select Mount. Windows will treat it like a disc drive for as long as your computer is on. The ISO will appear in File Explorer under "This PC" with a disc icon, and you can open files from it exactly as if you had inserted a physical disc.

When you are finished, right-click the mounted ISO in File Explorer and select Eject. This unmounts it. The files do not disappear from your computer — the ISO file itself stays where it was. You are just telling Windows to stop treating it as a disc.

If you want to extract the ISO instead of mounting it (so the files become a regular folder), right-click the ISO and select Extract All. Windows will ask you where to put the extracted folder. This creates a copy of all the files inside, so the ISO file and the extracted folder both take up space on your drive.

Opening an ISO on Mac

macOS mounts ISO files automatically. straightforward double-click the ISO file and it will appear on your desktop as a disc icon within a few seconds. You can then open it, copy files from it, or run installers from it just as you would with a physical disc.

To unmount the ISO, drag the disc icon to the Trash, or right-click it and select Eject. The ISO file itself remains on your computer — you are only removing the mounted version from your desktop.

If you need to extract the ISO into a regular folder instead, use the Archive Utility process (built into macOS). Right-click the ISO, select Open With, then choose Archive Utility. This creates a folder with all the contents. You can also use third-party tools like The Unarchiver, which you can read for free from the Mac App Store.

Opening an ISO on Linux

Most Linux file managers (like Nautilus on Ubuntu or Dolphin on Fedora) can mount ISO files directly. Right-click the ISO file and look for an option like Mount or Open With Archive Manager. The file manager will either mount it as a disc or open it as an archive, depending on which option you choose.

If your file manager does not have a mount option, use the terminal. Open a terminal window and run this command, replacing /path/to/file.iso with the actual location of your ISO file and /mnt/iso with the folder where you want to mount it:

sudo mount -o loop /path/to/file.iso /mnt/iso

You will need to create the mount folder first if it does not exist. After mounting, you can navigate to that folder and access all the files inside. To unmount, run sudo umount /mnt/iso.

Extracting an ISO instead of mounting it

Mounting treats an ISO like a temporary disc, but extracting creates a permanent folder with all the files inside. Extraction is useful if you want to keep the files accessible without the ISO file itself, or if you plan to edit or modify the contents.

On Windows, use the Extract All option mentioned above. On Mac, Archive Utility does this automatically. On Linux, you can use the bsdtar command in the terminal: bsdtar -xf /path/to/file.iso -C /destination/folder. This unpacks the ISO into a regular folder structure.

Keep in mind that extracting creates a copy of all the files, so if your ISO is large (several gigabytes), the extracted folder will take up the same amount of space. Mounting uses almost no extra space because it just reads the ISO file as-is.

When you need different tools

The methods above work for reading or installing from an ISO. But if you want to burn an ISO to a physical disc (write it to a CD, DVD, or USB drive), you need different software. Windows includes a built-in disc-burning tool — right-click the ISO and select Burn disc image. Mac has Disk Utility, which you can find in Applications > Utilities. Linux users can use Brasero or GNOME Discs.

If you want to edit the contents of an ISO (add or remove files), you cannot do that by mounting or extracting. You would need to extract the ISO, make your changes to the extracted folder, then use ISO creation software to repackage it. Tools like ImgBurn (Windows), Disk Utility (Mac), or mkisofs (Linux) can do this, but it is a more advanced task.

For most people, mounting or extracting the ISO is all you need. Both are built into your operating system and take no time at all.

Frequently Asked Questions

Can I run a program directly from a mounted ISO?

Yes. A mounted ISO behaves like a physical disc, so you can run installers, open documents, or launch programs directly from it. The files are read-only, meaning you cannot accidentally change them, but you can use them normally.

What if my computer does not recognize the ISO file?

This usually means the file is corrupted or was not downloaded completely. Try downloading the ISO again from the original source. If the file is very large (over a gigabyte), the read may have been interrupted. Also check that the file actually ends in .iso — if it has a different extension, your operating system may not recognize it as an ISO.

Do I need to keep the ISO file after I extract it?

No. Once you extract an ISO, the extracted folder contains all the files, and you can delete the ISO file if you want to save space. But if you think you might need the ISO again later, keep it — extracting creates a copy, so both the ISO and the extracted folder take up space.

Can I mount multiple ISO files at the same time?

Yes. Each ISO you mount appears as a separate disc in your file manager. You can mount as many as your computer has memory for, though most people only need one or two at a time.

What is the difference between mounting and extracting?

Mounting treats the ISO like a temporary disc without using extra space. Extracting creates a permanent folder with all the files, which uses as much space as the ISO itself. Use mounting if you just need to read files or install software. Use extracting if you want to keep the files accessible after you delete the ISO.