When performing a granular restore of a Hyper-V guest VM on Windows 2008 R2 or Windows 7 machine the following error message is shown by AhsayOBM
"VHD Mounter - Operating System (Platform Not Support)"
Granular restore of Hyper-V guest VMs is not supported on the current Windows operating system.
To resolve this problem install AhsayOBM/AhsayOBR on a supported Windows operating system to perform the granular restore for the Hyper-V guest VM.
Please refer to the following KB article for further details:
FAQ: Ahsay Software Compatibility List (SCL) for Granular and OpenDirect Restore (5250)
Hyper-V, guest VM, granular restore, supported platform, supported operating system