You can associate .lua files with it.
Go into the scriptbank folder and right click on any .lua file.
You should see an option to <open with notepad++>
If not you can use the <open with> option and browse out to the install location of notepad++ and associate it there also.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.