TGB 1.6 export function not working

How does the export function work in TGB 1.6? I have tried these and none seem to work. These were working in 1.5

....
$PREFS_PATH = "game/prefs/game_vars.cs";
.....

export("$game_vars::*", "~/game/prefs/game_vars.cs");
export("$game_vars::*", "game_vars.cs");
export("$game_vars::*",$PREFS_PATH);