How to convert a VMware's VMDK hard disk to Hyper-V's VHD format

Answer: Use Vmdk2Vhd.

Description from the creators's website:

Vmdk2Vhd is a simple utility to convert virtual hard drive images from VMWare's VMDK format into the Microsoft's VHD format. This is a sector by sector copy operation from one format to the other and the source file remains unaltered.