These are temporary files used by Microsoft's Virtual Machine application to hold state information.
Virtual Machines are software versions of a computer or in other words, a computer within a computer. These virtual machines are isolated from their parent computer and use the same hardware.
When a virtual machine session is ended, a temporary file is created that stores the machine's current state. This information is stored with a .VSV formatted file. The next time the session is restored, the machine's previous state information is retrieved and the .VSV file is deleted.