Question: What company created a high fantasy fictional universe including the table top wargame "Warhammer Fantasy Battle"as well as the game that was released for Microsoft Windows-based PCs on 28 September 2017?

Context paragraphs:
Asheron's Call: Asheron's Call (AC) was a fantasy MMORPG (massively multiplayer online role-playing game) for Microsoft Windows-based PCs developed and published by Turbine Entertainment Software.  Though it was developed by the Turbine team (with Microsoft's extensive assistance), it was published as a Microsoft title until 2004.  "Asheron's Call" was set on the island continent of Dereth and several surrounding smaller islands and archipelagos on the fictional planet of Auberean.  The game was played in a large, seamless 3D virtual world which could host thousands of players' characters (or avatars) at a time.

Lizardmen (Warhammer): The Lizardmen are a faction in the fictional Warhammer Fantasy setting, and an army in the tabletop wargame Warhammer Fantasy Battle (based in the same setting), which is created by Games Workshop.  The Lizardmen forces have a mesoamerican / Aztec themed culture, and are composed of various reptilian and amphibian creatures, including many based on dinosaurs and pterosaurs.

Total War: Warhammer II: Total War: Warhammer II is a turn-based strategy and real-time tactics video game developed by Creative Assembly and published by Sega.  It is part of the "Total War" series and the sequel to 2016's "".  The game is set in Games Workshop's "Warhammer Fantasy" fictional universe.  The game was released for Microsoft Windows-based PCs on 28 September 2017.

Warhammer 40,000: Warhammer 40,000 (informally known as Warhammer 40K, WH40K or simply 40K) is a tabletop miniature wargame produced by Games Workshop, set in a dystopian science fantasy universe.  "Warhammer 40,000" was created by Rick Priestley in 1987 as the futuristic companion to "Warhammer Fantasy Battle", sharing many game mechanics.  Expansions for "Warhammer 40,000" are released periodically which give rules for urban, planetary siege and large-scale combat.  The game is in its eighth edition, which was released on June 17, 2017.

Man O' War (game): Man O' War (sometimes also written as “Manowar”) is a now out-of-print table top war game by Games Workshop.  The game was set in the same realm of Warhammer Fantasy as used for the Warhammer Fantasy Battle and included most of the factions from that setting.  Other races of the Warhammer world were not included, either because they were lacking seafaring abilities (Wood Elves), missing from the main factions at that time (Ogres, Lizardmen), or both.

Warhammer Fantasy (setting): Warhammer Fantasy is a high fantasy fictional universe created by Games Workshop and used in many of its games, including the table top wargame "Warhammer Fantasy Battle", the "Warhammer Fantasy Roleplay" (WFRP) pen-and-paper role-playing game, and the MMORPG "".

Von Carstein: The Von Carsteins are a vampiric bloodline in the fictive setting of "Warhammer Fantasy", including the Warhammer Fantasy Battle tabletop wargame.  Their stories are told through background material in publications such as "Warhammer Armies: Undead" and "Vampire Counts" and in a trilogy of novels by Steven Savile; all three of which are published, "Inheritance", "Dominion" and "Retribution".

Warhammer Fantasy Battle: Warhammer: The Game of Fantasy Battles (formerly Warhammer Fantasy Battle and often abbreviated to Warhammer, WFB, and WHFB) is a tabletop wargame created by Games Workshop, and is the origin of the "Warhammer Fantasy" setting.  The game is designed for regiments of miniatures of various fantasy races such as humans (The Empire, Bretonnia, Kislev), Elves (Dark Elves, High Elves, Wood Elves), Dwarfs, Undead, and Orcs and Goblins, as well as some more unusual types such as Lizardmen, Skaven and the daemonic forces of Chaos, with each race having its own unique strengths and weaknesses.

Races and nations of Warhammer Fantasy: In the fictional "Warhammer Fantasy" setting by Games Workshop, there are a number of different races and nations.  The most important of these feature are individual armies in the Warhammer Fantasy Battle table top game.

Undead (Warhammer): The Undead of the Warhammer Fantasy Tabletop Wargame (Games Workshop ltd.), were introduced to the game in its very earliest editions.  The term itself can refer either to the undivided and all-inclusive army—ranging from ghosts and vampires to skeletons and mummies—or to the separate components which make up the two: The Tomb Kings of Khemri, and the Vampire Counts.  Up to and including the fifth edition of Warhammer Fantasy Battle, the Undead represented the combined forces.  For the sixth edition, Games Workshop divided the Undead into two separate armies to represent the chaos which Nagash created when he cast his Spell of Awakening to begin his assault on the lands of the living.

Supporting paragraphs: Total War: Warhammer II Warhammer Fantasy (setting)
Answer: Games Workshop