Издания категории Extra включают в себя информацию по устаревшим подразделениям, анонсированным бета-релизам, фан-разработки, одобренные GW и игровым сообществом и аналогичные материалы.
Во второй пакет вошли следующие книжечки:

Warhammer 40k - Codex - Errata - Armageddon Q&A v2.0
Warhammer 40k - Codex - Errata - Assassins Q&A v2.0
Warhammer 40k - Codex - Errata - Black Templars FAQ (2008)
Warhammer 40k - Codex - Errata - Blood Angels Q&A v1.0
Warhammer 40k - Codex - Errata - Carnage
Warhammer 40k - Codex - Errata - Catachan Q&A v1.0
Warhammer 40k - Codex - Errata - Chaos Space Marines FAQ (2008)
Warhammer 40k - Codex - Errata - Chaos Space Marines Q&A v3.0
Warhammer 40k - Codex - Errata - Chapter Approved Compilation Q&A v3
Warhammer 40k - Codex - Errata - Chapter Approved Q&A v3.0
Warhammer 40k - Codex - Errata - Daemon Hunters Q&A v1.0
Warhammer 40k - Codex - Errata - Dark Angels FAQ (2008)
Warhammer 40k - Codex - Errata - Dark Angels Q&A v2.0
Warhammer 40k - Codex - Errata - Dark Eldar Q&A v2.0
Warhammer 40k - Codex - Errata - Dark Eldars FAQ (2008)
Warhammer 40k - Codex - Errata - Demonhunters FAQ (2008)
Warhammer 40k - Codex - Errata - Eldar Q&A v2.0
Warhammer 40k - Codex - Errata - Eldars FAQ (2008)
Warhammer 40k - Codex - Errata - Imperial Guard FAQ (2008)
Warhammer 40k - Codex - Errata - Imperial Guard Q&A v1.0
Warhammer 40k - Codex - Errata - Necron Q&A v2.0
Warhammer 40k - Codex - Errata - Necrons FAQ (2008)
Warhammer 40k - Codex - Errata - Ork Q&A v1.0
Warhammer 40k - Codex - Errata - Orks FAQ (2008)
Warhammer 40k - Codex - Errata - Rule Book Clarifications v2
Warhammer 40k - Codex - Errata - Rules Q&A v3.0
Warhammer 40k - Codex - Errata - Space Marines FAQ (2008)
Warhammer 40k - Codex - Errata - Space Marines Q&A v3.0
Warhammer 40k - Codex - Errata - Space Wolves FAQ (2008)
Warhammer 40k - Codex - Errata - Space Wolves Q&A v1.0
Warhammer 40k - Codex - Errata - Tau FAQ (2008)
Warhammer 40k - Codex - Errata - Tau Q&A v2.0
Warhammer 40k - Codex - Errata - Trial Assault Rules v7.0
Warhammer 40k - Codex - Errata - Trial Vehicle Rules
Warhammer 40k - Codex - Errata - Tyranid Q&A v2.0
Warhammer 40k - Codex - Errata - Tyranids FAQ (2008)
Warhammer 40k - Codex - Errata - Witch Hunters FAQ (2008)
Warhammer 40k - Codex - Geanstealer Cult
Warhammer 40k - Codex - Harlequins
Warhammer 40k - Codex - Imperial Armour Macharius Tank
Warhammer 40k - Codex - Imperial Armour Malcador Tank
Warhammer 40k - Codex - Imperial Guard (3E)
Warhammer 40k - Codex - Index Astartes Grey Knights & Deathwatch
Warhammer 40k - Codex - Ordo Heredicus Strike Force (Unofficial)
Warhammer 40k - Codex - Orks (2008)
Warhammer 40k - Codex - Space Marines (3E)
Warhammer 40k - Codex - Space Marines (5E pages 51-144)
Warhammer 40k - Codex - Space Wolves
Warhammer 40K - Extra - Citadel Collectors 2008
Warhammer 40k - Hobby - Heros & Villains
Warhammer 40k - Rogue Trader - Eldars
Warhammer 40k - Rule Book - Battlefleet Gothic Rulebook - Necrons & Tyranids
Warhammer 40k - Rule Book - Bommerz Over Da Sulphur River