In short:
- Paste 0's after the .gsc script
- Update the .gsc file size (before the file name)
- Update the .ff file size (at the beginning in the .ff file)
- Update the .ff script file size (shortly after the .ff file size)
Also, use .FF Explorer instead of .FF Viewer:
http://www.mediafire.com/download/302xi97zo264i3c/FF+Explorer.exe
Note:
If you screw up, it may get stuck or freeze so be careful.
Enjoy!