The Tools.ToolsInstallType enumerated type defines the installation type of the Tools in the guest operating system.
UNKNOWN : Installation type is not known. Most likely tools have been installed by OSPs or open-vm-tools, but a version that does not report its install type or an install type that we do not recognize.
MSI : MSI is the installation type used for VMware Tools on Windows.
TAR : Tools have been installed by the tar installer.
OSP : OSPs are RPM or Debian packages tailored for the OS in the VM. See http://packages.vmware.com
OPEN_VM_TOOLS : open-vm-tools are the open-source version of VMware Tools, may have been packaged by the OS vendor.
Enumeration: MSI, OPEN_VM_TOOLS, OSP, TAR, UNKNOWN,