Recently I used Kernel for VHD recovery tool. You can use this software to recover VHD file in case your VHD fie is corrupt or loss. It scans both FAT and NTFS file systems of the virtual hard disk and then recovers the corrupt, damaged or lost files. The software recovers data in three recovery modes: Quick Scan, Extensive Scan and File Trace.
Find more details here:- http://www.restorevhd.com/