For the sake of the tutorial I’ll use PSN Crysis 1.
We’ll see how to convert PKG files of a PSN game into a folder bootable from External Storage (i.e: BLES-XXXXX folder) using Aldo’s PS3Tools. You might have some PSN games installed on your PS3 HDD with CFW and you want them in the External Storage (for future booting using your favorite Backup Manager) to free some space.