On VMWare ESX3, your VM has one or more VMDK files (extension .vmdk) and one or more flat vmdk files (last characters flat.vmdk )
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Upgrading Hardware and VMware Tools in Multiple Virtual Machines
When upgrading from VMWare ESX server 2.x to 3.x, you have to upgrade the VMWare Tools and virtual hardware for each virtual machine manually. With Virtual Center Server, you can upgrade all managed VM’s at once with a command line tool. This article describes the command and possible parameters for vmware-vmupgrade.exe
Howto: Recover corrupted VMDK files
On VMWare ESX3, your VM exists of one or more VMDK files (extension .vmdk) and one or more flat vmdk files