Unzip this file and / or included folders (which contain similar files) to the 'storyline' folder in your EverQuest directory.

The next time you log into, or restart EverQuest, this 'storyline' should appear in your 'Story Window' (Alt N, or EQ Button -> Storyline).

This file, the one you are reading, is not needed. It is simply here to guide you on what to do with the other file(s).