KB ID 0001122 

Problem

Seen on Windows 10, and Server 2012, when attempting to open or mount an ISO file, (even downloaded direct from Microsoft). You get the following error;

Note: Can also been seen with .VHD files.

Couldn’t Mount File

Sorry, there was a problem mounting the file.

Solution

Before you try anything else simply COPY the iso file to the root of your C: drive, and try again.

99% of the time simply copying the file to the C: drive will fix the problem, but if you’re still reading then that’s probably not the case for you? The problem is most likely that the ISO file has had the sparse attribute set.

Option 1

Download Remove Sparse > Extract the Contents and > Run the .reg file.

Now you have the option to remove Sparse on the right click menu.

Option 2

You can open an administrative command window and remove the sparse attribute from command line;

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fsutil sparse setflag {Path to the .iso file} 0

fsutil  sparse queryflag {Path to the .iso file}

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Related Articles, References, Credits, or External Links

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