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Thanks to Tally for posting this information on the Infinity Ward forums.

I have seen a few people in the forums struggling to swap around the weapons files in the COD4 demo. Here is a quick "how to".

1. First, you must run your mods for the demo from an fs_game folder.

Here is a .BAT file for you to copy:

@echo off
@echo STARTING COD4 DEMO
cd C:Program FilesActivisionCall of Duty 4 - Modern Warfare Demo
iw3sp.exe +set fs_game modsmymod
@echo COMPLETE

Copy that to a .txt file, and rename to something like "cod4 mod.bat"

2. Place the .BAT file on your desktop. Double click it, and you go into the demo as normal. Select which skill level you want (as usual), and go into the demo.

As soon as you are in the demo, exit it.

Look inside the COD4 demo directory, and you will see a new folder has been created:



Inside that will be another folder named "mymod". Place your mods in there.

3. For this test, I simply renamed the mp5 mp weapon file to m4_granadier, and it swaped around the default weapon you get in the demo (the m4_granadier) to the mp5:



Do whatever you want from there.