is that the ulgpGUI_v0.7 ?
That is the correct lgp tool to use; I think the Graphic User Interface (GUI) is very convenient.
The version of the uLGP GUI I use is .5 To make
all of Cloud's weapon models appear in game as Mike's Buster sword, but use another model for his Ultima Weapon, you will need to make copies of the Buster model file and replace each one of the other sword models with that file, excluding the Ultima Weapon file. There are 16 total weapon models for Cloud. These models are found encoded within the game data file battle.lgp. Once battle.lgp has been decoded, Cloud's weapon files all have 4 letter names and they go in a sequence starting with rtck and ending with rtcz. We want to copy Mike's version of the rtck file (Buster sword) 14 times and rename it the next file in the sequence for each copy. Then, ending with rtcz (the Ultima Weapon model) use Mike's version of that file.
Here is a more detailed walkthrough:
Backing Up - battle.lgp is located in the game directory at something like this path: C:\Games\FF7\data\battle\battle.lgp. Make a copy of battle.lgp and place it in a
non-system folder, like the C:\ directory. Rename the original file in the data\battle directory something like "battleBACKUP.lgp".
Unpacking the LGP - Create a new folder in a
non-system directory like C:\BattleFiles. Using uLGP utility, unpack the battle.lgp file from the C:\ folder or wherever you put it. The
Dump button should be selected, enter the LGP path with the LGP... button and select battle.lgp from the C:\ directory. Then using the Folder... button select C:\BattleFiles and finally press Start to unpack all of the files from the collection (C:\battle.lgp) into your new BattleFiles folder. This takes a while. All of the weapon model files are now included individually in the BattleFiles folder, along with lots of other files. One of the weapon files you mentioned: rtck (that is the buster sword model that Cloud has at the beginning of the game).
Making the New Fileset - Create a new folder in a
non-system directory like C:\CloudWeapons. Now, copy Mike's version of the file rtck to the CloudWeapons folder. Inside the CloudWeapons folder make another copy of rtck and paste it into the same folder. Don't overwrite the file, let it make a duplicate. It will have a weird name like "rtck - copy". Change the name of the file "rtck - copy" to "rtcl". Then paste another copy of rtck into the folder, it will again name the new file "rtck - copy". Rename it to the next 4 letters in the sequence, all beginning in rtc, so: "rtcm" is next. Continue this process over all the way until you have copied "rtck" into "rtcy". Now you should have 15 total files in your CloudWeapons folder, rtck through rtcy, and they should all be the exact same size.
The Last File - rtcz is the Ultima Weapon, if you have the one you want already, leave it out of CloudWeapons, if you hadn't installed it yet, you'll have to pick it out of the set of your choice. I use all Millenia's Cloud weapons personally, so if you needed that one you'd download her fileset (not the installer) and just pick out the one "rtcz" file from her set and move it to your CloudWeapons folder. For Mike's Ultima Weapon you'd do the same and simply place his version of "rtcz" into the CloudWeapons folder.
Replacing the LGP - Now that you have your CloudWeapons folder configured with the 15 or 16 files we've been copying, renaming, and plucking out, you need to copy all those files from within CloudWeapons and paste them into your BattleFiles folder. You will need to overwrite them all. Once you've overwritten the weapon files into your BattleFiles folder, use the uLGP utility again, make sure the
Encode button is selected; now enter the path for the battle.lgp file we placed in our
non-system directory like C:\ and enter the path to the BattleFiles folder. Finally hit Start to encode the battle.lgp file. The encoding process should be much faster than the decoding process. Now cut your newly encoded battle.lgp file from your C:\ directory and paste it into the game directory like so: C:\Games\FF7\data\battle\battle.lgp.
Cleanup and Uninstall - If you are satisfied with your results and do not wish to make further changes to your battle.lgp you can proceed to delete the BattleFiles folder as well as the CloudWeapons folder. To uninstall the mod for any reason you simply need to delete battle.lgp from your game's data/battle folder and rename the battleBACKUP.lgp file to battle.lgp.
Hope this is helpful to you. I've done this because it was a simple modification you wanted, but slight twist on file organization and seemed a reasonable request for clear instructions.
Edit: In the interest of practicing how to write instructions carefully, I've rewritten a good bit of this tutorial. I know quite well no one will use it, it was the process of fixing my mistake that mattered to me.
