Gunmatal cheats not working for me either

[ttops360z]

I acn find no relation between the F8 key and anything else. Also searches turn up no results for editing command line in shortcut.
I know this is an old game but could someone please help

[predcon1]

I had the same problem, but here's a link to a trainer I found that really works.

http://dlh.net/cheats/pc/deutsch/gunmetal/trainer.html

It's got health, ammo, and shield options.