Problem : Unable to Mount windows 10 ISO
Solution: execute this command from an elevated command prompt. Now you should be able to mount the ISO.
fsutil sparse setflag "File_Name
fsutil sparse setflag "Windows10_TechnicalPreview_x64_EN-US_10041.iso" 0
I was trying to mount the downloaded copy of windows 10 technical preview and it was giving error.
Finally the above command saved me.
Key : Problem mounting ISO on Hyper-v
Issue mounting ISO downloaded from technet / internet