Windows Virtual PC and server applications are integrated primarily with the .vsv file extension, and the files that are made with these applications are saved and bear the .vsv format. These files are believed to be the Virtual Machine Saved State File due to the state of its virtual machine memory that uses the said file extension and is called the VSV file. Virtual Machine snapshots are able to be saved and be reverted it to its original format with the use of these files. VSV files cannot be accessed directly since it is referenced by the VMC files. Windows Virtual PC virtualizes a basic PC and its related hardware. Supported Windows operating systems can work inside a Virtual PC, however, the other operating systems such as Linux may work, but are not officially supported, and Microsoft does not give the necessary Virtual Machine Additions, which include essential drivers for Linux.