cmd.exe is a Windows executable file located in Windows\System32 directory. It's the program which provides so called command prompt under Windows. The most close equivalent of it in UNIX world is a shell interpreter: bash, csh, zsh, etc. You type human readable commands and shell translates it in to actions changing state of your computer. Also cmd.exe is the program which executes/interprets bat files. Rigutils relies on cmd.exe heavily, so first of all you have to become accustomed to launching command prompt window and work with keyboard. Watch this excellent video introduction to the world of command prompt.