Cannot mount Windows 10 build 9879 ISO – Easy Fix

When trying to mount the Windows 10 Enterprise x64 build 9879 ISO in File Explorer, you may get the following error:

Couldn't Mount File, Sorry, there was a problem mounting the file.

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Workaround

This is a known issue when the sparse file attribute (P) is set on the file (9879.0.141103-1722.FBL_RELEASE_CLIENTENTERPRISE_VOL_X64FRE_en-us.ISO).

To make it work, simply make a copy of the ISO, or remove the sparse file attribute from it. Here is a link to a PowerShell function that removes the attribute: http://superuser.com/questions/818303/how-to-mount-an-iso-image-that-windows-8-1-refuses-to-mount

You can check the attribute by viewing the file properties (Details), or by running the following PowerShell command:

(get-item 9879.0.141103-1722.FBL_RELEASE_CLIENTENTERPRISE_VOL_X64FRE_en-us.ISO).attributes
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Checking attributes in PowerShell.
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Checking attributes in File Explorer.

Happy Deployment, Johan

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Johan Arwidmark

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Arjan.Mensch
Arjan.Mensch
7 years ago

Thanks Johan, fixed it using the copy method.

On a side-note, were you able to successfully deploy it using MDT2013? I had created a GOLDEN Image task sequence based on the 9860 iso, and imported the 9879 iso. But when I use it to deploy the GOLDEN Image task sequence, after the sysprep the VM reboots and boots into recovery mode each time..


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