If you only have a VHD file, and you want to convert it to VMDK format, WinImage (now at 9.0 version) can come to rescue. WinImage is a shareware but available for free evaluation use for up to 30 days. WinImage, which available in both 32-bit (x86) and 64-bit (x64) versions, is available for download from http://www.winimage.com/download.htm