Combination for the file cabinet in "Dad's office".

[famouscake]

I went through the whole game and didn't manage to find it. Anyone know where/what it is?

[Angry Nord-Grunge Syndicate]

Written on a folder at library. Can't remember what it is though.

[Shivoa]

0451, open a folder on a shelf in the library. Reference to: http://www.hitselfdestruct.com/2008/07/0451.html

[Gregalor]

When 0451 was a door combination in Bioshock Infinite, I wondered if that was a part of the game that Steve Gaynor of Fullbright Co. worked on.

[krimhorn]

0451 goes WAY back to the original System Shock. 451 opened the first door in that game, a variation on it opened a door in System Shock 2 and the current incarnation (0451) opened the armory at the beginning of the game and a couple of other things later on.

It's been carried across the years by various people who've worked on one of these games or another. Warren Spector likely carried it from Looking Glass to Ion Storm with Deus Ex and Ken Levine was likely the one who carried between Looking Glass and Irrational (into the Bioshock series).

As for Steve Gaynor: he was at 2K Marin during Bioshock 2 and was a principal on the Minerva's Den expansion. He also (apparently) worked for a time on Bioshock Infinite at Irrational. So, yes, the presence of the code is related.