You never edited this file?
You have to edit it as an administrator !
Maybe it has ReadOnly attributes or some other process is using it. U can check it by cut-paste it to other folder, if u can cut-paste it, then nothing is using this file, or make copy to desktop, edit file there and cut it back to game folder.
*This is the problem with new Windows op systems...admin is not admin, there is someone else, above the user. Next Windows will show middle finger at first start and shuts down...and will let the user to move cursor.
Anyway... I replaced Sherman tanks in Ardennes2coop and now enemy is shooting and throwing things at them.
Nothing else needed to do so i guess its the final version, i tested it on dedic server, download link remains the same, its already in Files section.
Tested N4, its quite easy when player moves from left side, both tanks can be skipped, maybe its best to destroy the one where the radio is but it can be skipped too.
Maybe new spawn only when tank is killed...
Sometimes "Enemy was killed" at start and some later.