.VMSD file extension

This is the basic program to work with .VMSD extension

VMware Workstation

VMware Workstation VMware snapshot metadata

VMware Workstation lets you run multiple operating systems as virtual machines inside your Windows PC. It is useful for IT professionals, developers, and businesses who build, test, and demo software applications for multiple OS platforms. VMware Workstation supports DirectX 10.1 and OpenGL 3.3 for a responsive interface while running 3D applications... (more)

The program works with the following extensions: ovf, xvm, vmc, vmt, vmx, ova, vmpl, vmsd, vmxf, vmdk, sv2i, vmsn, vmac, conf, vmba, vmhr, vmtm, vmxa, vmlog and nvram