Well after working hard to get a Modded Patch created by myself working. I decided to make a simple application that can help you create your own modded patch. Just unzip the MW2PatchMaker.zip into a folder, and put your PS3 Original "patch_mp.ff" (Altough I included a BLUS30377 patch there), and follow the instructions.

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How do I join 0000b4a0.dat and 00014f51.dat?
A= Open both files with HxD, then copy all the content from "00014f51.dat" at the bottom of "0000b4a0.dat"

How do I edit _missions.gsc (00000003.dat)?
A= You need to edit this file with your favorite Text Editor, altough I recommend using You must login or register to view this content.

How do I use this application?
A= Follow the You must login or register to view this content. or You must login or register to view this content.. (It's on page 2 and 3)

Do you host challenge lobbies?
A= No, I just host fun lobbies for my friends (Like Zombies, and Alien vs Predator)..

Could you edit a patch for me?
A= Follow the tutorial, it's easy. If you have questions, just ask them and I'll help you.

P If you found any errors, please post them here. And i'll fix it as soon as possible. I also may do an updated version with a better UI (User Interface) later.

Wishlist for version 2.0:

• Better UI (User Interface)
  
• Try to make everything automatic (Except editing the patch, obviously, lol.)
  

[multipage=Tutorial]

1. Open MW2PatchCreator.exe and follow on-screen instructions, until you see "Now we'll decompress patch_mp.ff".
2. The decompressed patch, will be on the "Stuff" folder.
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3. Now open both: "0000b4a0.dat" and "00014f51.dat" for you to join them.
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4. Copy all the content from "00014f51.dat".
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5. And paste it on the bottom of "0000b4a0.dat".
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6. Then save the file as: "0000b4a0_00014f51.dat".
7. Now on the joined file, Click Ctrl+E and do what you see on the image.
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8. Then copy everything on the new document and save it as: "_missions.gsc"
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9. Keep following the instruction on-screen, until you see "Now we'll decompress _missions.gsc"
10. Go to the "Missions" folder (The application will create it)
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11. Edit the "00000003.dat" with Notepad++ (You may copy the _missions.gsc from a patch you created using iHC Patch Maker)
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12. Then save the file
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13. Open "_missions.gsc" with HxD and delete all of it's content. Then save it.
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14. Keep following on-screen instructions until you see "We've injected the 00000003.dat into your _missions.gsc"
15. Then open "_missions.gsc" and fix the header. (Replace the first "00 00 00" with "00 78 DA")
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16. Fill the bottom of the file with 00's until you reach the offset "24EC", but change the last "00 00 00 00" to "FF FF FF FF"
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17. Then insert "_missions.gsc" back on "0000b4a0_00014f51.dat" (Ctrl+E - Start: D7D1 - End: 1061C)
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18. Go back to the "00000003.dat" and right-click it, then click on Properties and check out the "Size".
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19. Convert the file size to hexadecimal using Google, Search "[Size] in hexadecimal"
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20. Write the file-size in hexadecimal on the next offsets (Before the "FF FF FF FF")
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21. Split the "0000b4a0_00014f51.dat" back into "0000b4a0.dat" and "00014f51.dat" (Ctrl+E - Start: 0 - End: FFFF, then copy all that on "0000b4a0.dat", and Ctrl+E - Start: 10000 - End: 1FFFF, and copy all that on "00014f51.dat").
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You must login or register to view this content. (On that image I deleted the 1st document splitted).
22. Keep following on-screen instructions.
23. Congratulations, you've succesfully modified your "patch_mp.ff"!

[multipage=Video Tutorial]
As a lot of people were asking for this, I've decided to make a tutorial of me modding a patch. The quality is not that good at the moment, but will be better in some minutes or hours.