Check OS version in VHD file

If you need to check the version Windows on a VHD file without turning it on, use the /Get-CurrentEdition switch of the Deployment Image Servicing and Management (DISM) tool.

Link

Moving/Exporting VHDs in Hyper-V

If you need to move VHDs to a different HDD on the same physical host, this is not ideal but should suffice:

http://blogs.msdn.com/b/virtual_pc_guy/archive/2008/08/26/hyper-v-export-import-part-1.aspx

NOTE: Exporting is usually used to move a VHD to a different physical host.