What's a file named 'hl3.txt' doing in Dota 2's latest update?


Um, what's this, Valve? SteamDB noticed some interesting new files (opens in new tab) added to Dota 2, and we've downloaded them and verified that they exist. The files are: hl3.txt, rpg.txt, and ai_basenpc.txt.

Here's a line from hl3.txt:

string m_HelpText = "Combine Pulse Ceiling Turret"

The files, which appear to be help text for a development tool, also refer to vehicles, NPC behaviors, squad behaviors, ziplines, and quests. Here's another example:

string m_HelpText = "NPCs that are in the same squad (i.e. have matching squad names) will share information about enemies, and will take turns attacking and covering each other."

Are these just some old files that were misplaced and have nothing to do with anything, or do they have to do with Dota 2? Or are they actual files related to the development of Half-Life 3? Here are the files so you can look for yourself: hl3.txt (opens in new tab) / rpg.txt (opens in new tab) / ai_basenpc.txt (opens in new tab).

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Tyler Wilde
Executive Editor

Tyler grew up in Silicon Valley during the rise of personal computers, playing games like Zork and Arkanoid on the early PCs his parents brought home. He was later captivated by Myst, SimCity, Civilization, Command & Conquer, Bushido Blade (yeah, he had Bleem!), and all the shooters they call "boomer shooters" now. In 2006, Tyler wrote his first professional review of a videogame: Super Dragon Ball Z for the PS2. He thought it was OK. In 2011, he joined PC Gamer, and today he's focused on the site's news coverage. His hobbies include amateur boxing and adding to his 1,200-plus hours in Rocket League.