Hi,
Many moons ago I wrote a tool called Game2Source that was designed for this kind of situations.
Many designers and even GM were not so happy with this tool that could decompile games. So I built in a safety signature that needs to be applied before compiling the game.
Only when the game has a valid signature it can be decompiled again.
Nonetheless I abandoned the project and it was never updated to be compatible with the current version of AM.
So long story short, currently there is NO tool anymore but you can still download Game2Source from my website... if there is enough intrest and requests I could consider updating it
Sorry for your loss.
With best regards,
ShAdOwHuNtEr