Well...I am working on a mod...and this might possibly a RM8FC Version if possible...
I thought the images for RM8FC were compressed differently. as in unusable for modding.
RM8FC is impossible to mod (for now), i intent too with the dark translation program, and after it when is descompressed all that is in the file is erased.
but, if you want to do a mod, there is a game that can be mod. is rosenkreuzstilette, a megaman parody with some hot girls. first i recommend that you download and beat it, after, search in google "rks data archive decoder" and put the third link. there is a link for the rks data archive decoder, and a complete tutorial, include how to change the music (here is more easy, because now the music isnt pptune, is ogg). im modding this game too, and that all i can say, it fits very good. im thinking to do a sequel of my game (Dark saturn 7) with this game (DarkSaturn rks) and another notice !!!now isnt 8 bit obligatory!!! the image archive are png!!!!
(note: if you want to change a song to ogg, use total video converter, and see some others program to cut off the music, and change the normal volume, this is soo important, because if you dont want to see a very big time with silence in the stage, or you see that one song are very strongly that another song. it pass to me)