I have installed 2.25 beta8 and i noticed that in the aw\scripts folder i have less files than in previous versions... In this image you can see the files (those not marked) that are not in the actual version.... Do I need to delete them or i have to mantain them in my awscripts folder ?

Michele,

All these files are now controlled by a bower script, and stored in the bower folder

So, yes, you can delete them.