dll is a 1kb file, it's auto installed when you install rmxp
installing rmxp or the rtp package will save you the gigantic problem of putting the stupid dll file in windows\system32 folder.
if you need it , find it in windows\system32 , named rgss(some weird combination of letters and numbers) .dll
you will still need every image you used, rtp images are for the last time NOT INSIDE THE STUPID PROJECT FOLDER so "making a game disk" won't help you bit, the rtp can be found inside rmxp's main folder rmxppknights\graphics folder
and it's not crankeye edition, it's p.knights edition -.-