Mount a Virtual PC's VHD disk image

Virtual Server 2005 R2 SP1 Beta 2 includes 'vhdmount' - a tool to allow you to mount a virtual hard disk directly on your host operating system. While vhdmount is provided as a command line tool - a very small amount of work will allow you to mount VHDs by just double clicking on them. By creating a .reg file with the following contents:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Virtual.Machine.HD]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Virtual.Machine.HD\shell]

@="Mount"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Virtual.Machine.HD\shell\Dismount]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Virtual.Machine.HD\shell\Dismount\command]

@="\"C:\\Program Files\\Microsoft Virtual Server\\Vhdmount\\vhdmount.exe\" /u \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Virtual.Machine.HD\shell\Mount]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Virtual.Machine.HD\shell\Mount\command]

@="\"C:\\Program Files\\Microsoft Virtual Server\\Vhdmount\\vhdmount.exe\" /p \"%1\""

[HKEY_CLASSES_ROOT\.vhd]

@="Virtual.Machine.HD"

And then double clicking on the .reg file (to load it into your registry) you will be able to double click a VHD to mount it, and right click on it to dismount it.

Reference: http://blogs.msdn.com/virtual_pc_guy/archive/2006/09/01/734435.aspx