Resource list (Source)

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A .res file accompanies a .bsp file when the map uses custom content. The .res's filename is the same as the map's. and has the same name. It contains something like:

"Resources" 
{ 
	"materials/materialsubfolder/material name.vmt"	"file" 
	"materials/materialsubfolder/material name.vtf"	"file" 
}

Note: You don't have to precache the .bsp, .txt, .res, .ain, or .nav file. They're already precached by the game automatically.

There's a couple of programs out there to help with this:

RESGen is a tool to create .res files for Half-Life: http://www.thezproject.org/projects.php?pid=2

ResMaker: http://halflife2.filefront.com/file/HalfLife_2_CS_Source_ResMaker;34374