Requirements:
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1. Once you launch the PKG_Extractor you'll have to point to your pkg.idx and it'll load the game files. When done loading it'll allow you to search/edit/add files. Do so according to what you are after.
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2. Picture above shows you how to add files to the export list.
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3. The cool thing about this program is that you can add additional files like it's a repacker itself which it indeed is, lol. Do so by filling the two textboxes and hit the first button below the second textbox. Save the exported ffoep file whereever you want.
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4. It's time for the actual repacking part. Click on the third radio checkbox and then the first button below the list box and point to your chinese client main directory. Once that's done click on the button again and this time point to the ffoep file you saved earlier.
Note: You must have a valid game.bin otherwise the repacker won't do its work which is not what you want.
... and you're done! Apply this with the translation files I provided.