Loop mounting was not available on Microsoft Windows operating systems until , where this functionality is natively implemented, and available through the diskpart utility. However, the facility is often added using third-party applications such as "Daemon Tools" and "Alcohol 120%". Freely-available tools from VMware (Disk Mount Utility) and LTR Data (ImDisk) can also be used to achieve similar functionality. Under Windows XP and Vista it is also possible to use the virtual hard disk feature by adding some component from Microsoft Virtual Server 2005 R2.