This file is used by ma_decal, and is also used in conjunction with mapadverts.txt.
The name and location for each decal is placed in this file, as well as the download location. These will be downloaded as a player enters your server.
Edit the file $BASE/cstrike/cfg/mani_admin_plugin/decallist.txt
An example of the file is here
"decallist.txt"
{
// List decal textures to be available for custom effects via ma_effect
// and for the map adverts.
//
// The first label is the name you use within the ma_effect command and ma_decal to reference
// the decal texture, the second is the location of the decal itself
// You can view the decals from the Valve Hammer Editor.
"lambda" "decals/lambdaspray_2a"
"mani_logo" "decals/custom/mani_admin_plugin/mani_logo"
"downloads"
{
// Add your auto downloads here, each player will be forced
// to download this content. Try to make your own decal filenames to
// be unique as possible as your download will NOT overwrite an
// existing file with the same name.
//
"mani_logo.vmt" "materials/decals/custom/mani_admin_plugin/mani_logo.vmt"
"mani_logo.vtf" "materials/decals/custom/mani_admin_plugin/mani_logo.vtf"
}
}