Cannot mount Windows 10 build 9879 ISO – Easy Fix

14 november, 2014

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:

1
(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.

/Johan Arwidmark