I need to know the content of the script in the Notepad
Not too difficult if you have AutoLisp capability [i.e. you are not using AutoCAD LT]. But do you want to Explode everything on all Layers other than that one? Or only certain kinds of things? Blocks? Polylines? Mtext? Dimensions? Leaders? Hatch patterns? Regions? Mlines? Associative Arrays? etc.