This will allow you to edit various aspects of the game .hack//INFECTION only right now. It may be extended to work for the rest of the games in the quadrilogy. Don't worry about needing to download external files, everything you need to look at the data is included in the package.
Instructions on Use
Load GCMN.PRG for everything (currently)that is not character stats. If loading character stats, load DEMO.PRG. If loading Trade Lists, load SLUS_202.67
Load the appropriate module (.nmm) you wish to modify depending on your current need.
Save in the program, which will save to the file. With that file you can either use a tool to replace the existing file in the ISO (such as CDBurn or CDMage) or use a hex editor (I suggest HxD) to open both the file you've worked on and the dot hack ISO to find the location of the start of the file in the ISO by copying the first several lines and simply copy the file (Ctrl+A) though I will also put the addresses here for easy access.
0x013BD800 - .hack//Infection ISO - DEMO.PRG Start 0x01436800 - .hack//Infection ISO - GCMN.PRG Start 0x0B9800 - .hack//Infection ISO - SLUS_202.67 Start
That should do it! From there your changes should take effect.
Included within is...
Original post here https://www.reddit.com/r/DotHack/comments/wezm9h/dot_hack_infection_editor_now_available/