Meh, updated 1 hour after I rewrite my project with "require" and .rsc >_<
I see you haven't protected the script against malicious use yet. You should check if the file is encrypted (I think checking the existence of the rgssad should be enough, but you can get more paranoid than that) and, if it is, don't allow load_data to open external rsc files (by checking their non-existance when using FileTest).
I quote someone I won't name (take that, Tr...someone I won't name !), NOW GO BACK TO WORK !!!!!