Yes there is, but the process is based off the way you installed it, if you used the ROR Official Installer,which is currently for 0.4.7.0 only, then it should be in your program files, most likely Program Files x86. If you directly downloaded the game (In a zip or some kind of compressed folder) then you would find it in were you installed/extracted the games files. If you used itch.io, for 0.4.8.0, then it should be in C:\Users\INSERTYOURNAMEHERE\AppData\Roaming\itch\apps\rigs-of-rods.
The executable should be called Ror.exe, you can open that to play the game, but if you did use itch.io you can also launch it from the app.