Mis-type on my part--meant to type OBMM. So, I can create an OMOD for the first Better Cities file, works fine--just can't seem to extract the resource files. It's really weird--I've tried 7zip, and the Universal Extractor--it just keeps throwing up an error message. So...yeah. Any idea what might be up with that? I've got them in the same folder and everything...
Sweet lord finally...turns out the second part was corrupted. Re-downloaded, re-sorted, and works great! Thanks for your help; really appreciated.