Information:

Specimen: Basic information concerning Dr. Birkin.
Research: Information about the viruses that consumed Birkin's life.
Confidante: Information about the relationship between Dr. Birkin and Albert Wesker. Also contains Wesker's Report II, which contains much information about Birkin.
Ignorant Masses: Dr. Birkin's relationships with other Resident Evil/Biohazard Characters.
Hidden Jewel: Information about the locket Sherry Birkin carries around her neck.
Alter-Ego: Information about the many malformations of Dr. Birkin while infused with the G-virus.
Veneer: Dr. Birkin's appearance in detail.
Research Material: Files and documents from the Resident Evil games either concering or written by Dr. Birkin.
Storyline: Information on Resident Evil 2, and Resident Evil: Zero, the games that William Birkin appeared in.