I don't understand why you would want to delete the files directly from the saves folder rather than just deleting the save at the in game menus. It is much easier, cleaner and safer to use the in game method. From your post, it sounds like you don't know how to find it so here's how:
There are a couple of places you can delete a save. You can do it from the "Main Menu" by clicking "Load Game" or you can do it from within the game from the "Options Menu" in the upper right corner and then click the "Save As" menu. Both lead you to a list of your saves with a thumbnail for each save. Just mouse over each thumbnail and you will get a small popup that tells you the save name, the household name you were playing when the save was made and date and time of that save so you can be sure of exactly which save it is. A little red X will appear in the upper right corner of the thumbnail. Clicking on the X will delete the save and all files associated with it regardless of when they were actually saved. It also gives you an "Are You Sure" popup after hitting the X so you have one last chance to back out if you need or want to.
It is much safer to do it this way since you can't inadvertently delete a file belonging to another save and risk messing it up.
Hope this helps.
