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A .pvs file stores configuration of Parallels Desktop virtual machine. You can transform it to VMware virtual machine with VMware vCenter Converter Standalone software, but you will also need the hard drive (.hdd) associated with your .pvs configuration file for the pvs to vmdk conversion to work.
When done, .hdd file will be transformed to .vmdk file and .pvs file will be saved as .vmx configuration file for VMware.
PVS
A pvs file extension is related to the Parallels Desktop, a virtualization software for Apple Mac computers. A pvs file stores configuration of virtual machine.
VMDK
A vmdk file extension is used for default virtual disk format of VMware virtualization software. A vmdk file stores contents of virtual machine hard disk drive. There can be more vmdk files for each virtual machines, depending on the specified amount of virtual hard drive assigned to it. It also can store information about partitions virtual drive is able to access.