Problem with Farcry

[Blackmothercraig]

Ok, I only just got Farcry, and it runs beautifully on my new machin yadda yadda yadda.

Only problem is, I'm currently on the "Pier" map, and due to blow up the evil dudes armory... Problem is, I can't get into the armory. I have the Keycard, I have the explosives, but whenever I walk up to the armory door, it doesn't budge....

Every walkthrough I've read to try and find out if there's something I'm not doing just states "enter the Armory" so I kinda figure that the game is screwed in some dirty way...

Any help would be appreciated. I know I'm a Nooooob and such, but I only really signed up to get some help, so i can continue playing this LURSH game.

Cheers.