ryo-no-o download my refrence files. in the folders you will find a BAT file with a name similar to convertoriginal.bat.
copy the bat to the same folder name in the mod. copy in the relevent convertdata from your sins game folder.
open a dos box in the folder
run bat wait a long wile while the bat converts each file individually. the batches were crafted for the folder contents. if you want to convert an entire mod's complete folder structure then the latest release of my modding utilities should be able to do it just extract all the files from the rar.