I have followed the guide and created the single growable file, on a Windows 7 machine running VMWorkstation v7.1, then i have coped the resultant file to the ProxMox Machine, renmaed it to match what the virtual machine thinks the disk name should be, but then I get an error, "Error loading operating System" in the console window. I am needing to get this working as I want to implement PROXMOX in a environment instead of vSphere or ESX. And I already have the System images built in Workstation.
The command to convert was "C:\Program Files (x86)\VMware\VMware Workstation\vmware-vdiskmanager" -r winxp.vmdk -t 0 winxp-pve.vmdk
This created a 19gb file that i then WinScp'd to the proxmox server.