Gamedata file names inconsistency in L4D1

[dragokas]

In https://github.com/alliedmodders/sourcemod/tree/master/gamedata/sdktools.games there are:

• engine.l4d2.txt
• game.left4dead2.txt for L4D2, but only one file:
• engine.l4d.txt for L4D1.

Futhermore: game.left4dead2.txt and engine.l4d.txt contains identical keys like: "GiveNamedItem" (function from server.so for both games).

Is it by intention L4D1 doesn't have a game.left4dead.txt file similar to one in L4D2? As I can see, both game. and engine. files contents refers to server.so in "Signatures" section, so what's the differentiation between them in such case?

[asherkin]

When Nuclear Dawn launched it used the L4D2 engine, so both games shared the engine.l4d2.txt gamedata.

All these files are merged together according to the rules in master.games.txt and their internal game/engine restrictions, the on-disk layout is irrelevant.