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So, I wasn't aware that my autosave was turned off, and after 2 hours of play... I no longer have a save file. Is there any way to unlock all chapters so I can pick up where I left off?
Supposedly, this code should unlock all levels - "Enter "J8OL14FD" as a case-sensitive name to unlock all levels and sequences.", but you'll find many people complaining that it doesn't work. So, if it doesn't work for you too, you can try to use save files from someone else.
For anyone that it does not work for they may want to try changing Cheat=0 to Cheat=1 in the Fahrenheit.ini config file.