Pregame Resource Check

Basically, would it be possible to have a script that checks all file usage in the game through the json data files that reference images, music and the like (such as a character image in a character json file) before the entire game starts?

Also, if possible, to cache these resources? (If not, then ok - I'll make another req later.)

I'm willing to have a long startup time to check all of this pregame if it means there is no ingame "lag" (if the cache option is used) or mistakes from missed, accidentally-deleted resources.

Thanks.

EDIT: Solved, here:

http://mvplugins.tordamian.com/plugins/preload-manager/

Thanks Tor :D