If you already have a virtual machine stored on your Mac, but it is missing from Virtual Machines Directory , you can easily add it by opening its PVM file in Parallels Desktop.
Parallels Desktop 4 enables you to work with your virtual machines created in Parallels Desktop 3.0 and in other virtualization products, including VMware Fusion, Virtual PC, and VirtualBox. All you need is to convert them to Parallels Desktop 4 format. The converting is performed when you add these virtual machines to Parallels Desktop.
To add a virtual machine that already exists on your Mac:
.pvs
extension.
.vmx
extension.
.vmc
extension.
.xml
extension.
Note: Parallels Desktop and VMware Fusion virtual machines may be stored in Mac OS X as bundles of files. The configuration file is stored inside the virtual machine bundle.
If your copy of Parallels Desktop is not activated, you will be prompted to activate it when the virtual machine is added to Parallels Desktop 4. For more information about the activation, see Activating Parallels Desktop .