After I've got the blueprint in the toilet, I entered the office door and was interrogated by Dick Castro. I managed to escape the office using the air duct leading to the toilet. Later in the game, I realized that I need to go back to Dick's office to get something from his safe. But when I tried to enter his office, I immediately died. I had already overwritten my save files after I escaped so loading a previous save game doesn't solve the problem.
Can anyone email me a save file before the interrogation part?

I'm bringing this thread back because I'm in the same situation :(

Fortunately I have some saved games as backups, but still this is very annoying. We should compile a list of dead-ends in these games.