Huge map file (1,73mb) with a countless amount of objects, vehicles, markers and some peds ... looks like a lot of work, to be honest it looks like too much work for someone to release it just like that. My guess is he ripped this from a reallife/rpg server and now releasing it here.
//edit: if you actually made this yourself, you have my respect ...but you should really not release this it like that, actually you should not release it at all, but sell it to someone with a server.