File with an ERP extension contains an archive of data of different sorts: graphic, music, sounds or other used in the Alter Ego game to load its content. The game was created in the year 2010, on the basis of AGDS engine developed by Future Games, as its final production. The game of the same title from 1984 does not use the same files.

Unpacking the archive is possible with the Alter Ego ERP unpacker tool, in order to display content, and compressed with possible modifications with thee Alter Ego ERP packer tool.