VMWare Server: One or More of the Disks Used by This Virtual Machine Was Created by an Unsupported Version

If you have created your VM using the VMware Converter and now you're finding out that you chose the wrong target version, simply do this:

1. open your .vmx file

2. replace virtualHW.version = "6" with virtualHW.version = "4"

3. open your disk image (vmdk) (use a hexeditor… you're opening a gb+ file here)

4. replace ddb.virtualHWVersion = "6" with ddb.virtualHWVersion = "4"

Voila , it should work