Steam game icons

Does anyone here know how to add a Steam game icon to a Half-Life mod? I know how to do this for Source mods, but that method doesn't quite work for Half-Life mods, namely because they use liblist.gam files rather than gameinfo.txt ones.

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Create-ivity - a game development blog

Well, I finally got my answer on the Steam forums (would you have expected that?).

The solution is simple: Source mods use the following line in their gameinfo.txt: 'icon "path/icon"'. Half-Life mods can have this same line in their liblist.gam and it will work, but there's one pitfall for them: there must be only a single space between icon and "path/icon", otherwise it won't work.
For the icon file the same rules apply to any mod, whether it's HL or Source: it must be a 16x16 .tga file.

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Create-ivity - a game development blog