I think it would be inside cfg/sourcemod/ folder. Some plugin is actually running a cfg file not ignoring the commented lines... Just my guess.
Here is an example of code in weapon restrict plugin:
PHP Code:
//Config loader. Loads configs for specific map or prefix.
CheckConfig()
{
decl String:file[300];
decl String:map[100];
decl String:pref[10];
GetCurrentMap(map, sizeof(map));
BuildPath(Path_SM, file, sizeof(file), "configs/restrict/%s.cfg", map);
if(!RunFile(file))
{
SplitString(map, "_", pref, sizeof(pref));
BuildPath(Path_SM, file, sizeof(file), "configs/restrict/%s_.cfg", pref);
RunFile(file);
}
}