My friend Neil needed to expand the size of a VMWare disk from 10GB to 20GB.
Initially the idea was to rebuild the VM image, however there had to be a workaround.
We found it "here"
As the disk was the system disk we needed to follow the special instructions in the comments. "To do the system disk you will ned a second virtual machine. Mount the System disk on another virtual machine and a second disk, run diskpart on the disk and then shutdown the machine. No start up the original machine and voila you now have a larger system disk."
Bless those MCPs.