Wrench, You're right on.
There "must" be a Data.ini in each Folder. The SF2 Weapons Editor adds Weapons this way. If adding a new Weapon using the Editor, First You must have the Files in a Type Weapons Folder as described above. Next, You'll want to add the Weapon. Open the Weapon Editor and select the "Import/Merge" Button. navigate to the New Weapon Folder and select the Weapon's_Data.INI. Once done, hit "Save" and the new Information is saved to a .DAT File that no one sees. Why? because it's in the Core Engine of the Game Install. No need to mess with it any more like the "Old" Days. Also, the Editor can determine what Weapons go with what Install. i.e. SF2 Weapons with it's Install and SF2V with it's Weapons....and so on. If One uses the Instructions that Wrench has posted and add them As I have just discribed, You'll have endless amounts of Weapons that are more easier manage. I purchased SF2 at the first of the Year. I now have 2012 Weapons working in SF2. Now all We need is the Gun Editor from TK......