I am uploading it here at the request of a modder who wanted to use it. I had no involvement in the creation of this tool whatsoever. (That tutorial is for people making mod packs for Napoleon: Total War, but I followed the instructions and successfully made mod packs for Empire: Total War).
If you need a tutorial on how to use Pack File Manager (PFM) to create a mod, I recommend the tutorial by erasmus777 here. Pack File Manager 1.9 is one of a range of pack file managers which enable modders to create mod packs and edit database tables.