Well you could just use process explorer to tell you the path of the executable, or if you don't have that you could just use task manager to see the name of the executable, then search your disk for it.
eg my task manager shows the executable is called astronomy_0.21_sse3.exe
and that lives in the above folder.
eg my task manager shows the executable is called astronomy_0.21_sse3.exe
and that lives in the above folder.