What does the Map_Cache do/mean?

[Statyk]

Game automatically creates a cache file to load things faster.
Bad thing is, while testing, if you haven't setup developer environment, game will load cache file and you won't be seeing your changes to your map.

Thank you so much for letting me know. with that info, I was able to figure out why my custom menu wasn't showing up (I saved the map over it but never deleted the original map_cache. =D works now!