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Half-Life 2: Episode One

Mounts from your Half-Life 2 install, over the Half-Life 2 content it builds on. Nothing converts or shows on screen yet.

Ticket
#004
Checked on
Steam, Linux
Last checked
November 1, 2026
Files
35,612
Mount
episodic/pc/9912070

Mounting

4 of 4 done
  • Done

    Finds your copy

    Picks up the install on its own, from Steam or wherever it lives.

  • Done

    Reads every file

    Every file reads straight from your copy, in the order the game itself looks them up.

  • Done

    Matches players' copies

    Your copy is fingerprinted from its own files, so a server can check everyone's match without sending any game content.

  • Done

    Brings its mods

    Folders and VPKs in custom/, its own and Half-Life 2's. Checked on test installs, since the checked copy had none.

Converting

0 of 4 done
  • To do

    Models

    Source's model converter works for Garry's Mod. It isn't hooked up to Episode One yet.

  • To do

    Textures and materials

    Waits on Half-Life 2's own shader table.

  • To do

    Maps

    Its maps are the same kind Garry's Mod's map converter already reads.

  • To do

    Sounds

    Its sounds turn into Evil Engine sounds.

In game

0 of 3 done
  • To do

    Shows on screen

    Converted content actually draws in Evil Engine.

  • To do

    In the spawn menu

    Its props and models land in your spawn menu, no Plugin needed.

  • To do

    Maps you can visit

    Pick one of its maps from the menu and fly around inside it.

Where it stands

Episode One lives in its own episodic folder inside the Half-Life 2 install, and comes from the same pointer as Half-Life 2. It reads in the order its own gameinfo.txt lists: its archive over Half-Life 2’s five, then its loose files over Half-Life 2’s, a little over 35,000 files in 12 to 20 ms. That order matches the search paths the game itself prints when it runs.

Your copy is fingerprinted as two parts, episodic and hl2, and hl2 is the very same part Half-Life 2 has. Steam installs the episode’s files through Half-Life 2’s own app, and every file in both parts matched Steam’s checksums for them.

Known issues

  • gameinfo.txt names voice archives that Steam doesn’t install. They’re noted on the mount and skipped.
  • One sound in Half-Life 2’s English voice archive fails its own checksum. Garry’s Mod’s copy of the same archive does too, so it’s read as Steam ships it.

Next up

  • Hooking Source’s converters up to Episode One, with a shader table from Half-Life 2’s own shaders.
  • Garry’s Mod mounting the episode’s content from this mount, as part of Half-Life 2’s.