ISO Error: Sorry There Was a Problem Mounting the File

Issue: You downloaded a file from Microsoft, such as the Windows 10 Preview. The ISO downloads successfully, but when you try to mount it using Windows 8 or 8.1, you get the error:
Sorry, there was a problem mounting the file.

Sorry, there was a problem mounting the file.

Sorry, there was a problem mounting the file.

Cause: Sometimes when you download a file from Microsoft it has the sparse flag set on it, which prevents it from mounting the ISO.

Fix: Remove the sparse flag.

You can do this two ways:
1) Copy the file. The copy removes the sparse flag, so your copy will work; however, since ISO files may be gigs of data, this may not be an option.

OR

2) Remove the flag using the fsutil command.
fsutil sparse setflag yourfilename.iso 0

fsutil command to remove the sparse flag

fsutil command to remove the sparse flag

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