Getting the PS3 controller to work has nothing to do directly with Unity, as Unity uses the underlying OS API to access the inputs. So if you can get the controller working fine with windows(in the control panel for example), then Unity should be able to use it.
One method is to search for DS3 Tool. It provides a driver that can make the PS3 controller work via different emulations, including a DInput device or an XBOX360 controller. Windows does not have any available drivers included, and Sony does not provide one(they really should honestly), so you have to go for 3rd party stuff.
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