It depends on whether you install the game to the nand or the sd card.
If you install it to the sd card, there is a subfolder somewhere inside the nintendo folder with the ticket number of the game.
That contains all game binaries.
I don't know which folder is used on the nand as you normally can't browse that directly.
The save files are stored on the NAND in a separate location and you can manage those with the homebrew app 'checkpoint'.