weaponizer.exe and CoD5_Weaponizer.exe convert weapon file to text and text to weaponfile.

The weapon files are not really human readable because the contain a single very long line of text.
weaponizer.exe breaks it into single line that are easy to edit.

To use them:
Open a weapon file.

It gets converted to text. 
Open the text file and edit it.  Comments can be added (C++ style //).  Blank lines can be added to separate related parts.

Save the text file, and open it with weaponizer.exe to convert it back into a weapon file.