Opening EPA file with NWDS

hi eveyone.

Can i open an epa file of any SAP business package or for that matter an epa fie which i have created in NWDS. my aim is to change some of the iviews which are present in the epa file.alos i have to modify some of the iviews present inside the epa file- i beliive for that i wil have to open in in NWDS EP perspective and modify the code?

am i on the right track ? how am it achieve my goal?