I guess you have to change the name to "New_(Ex:Awm).dtx" "New_Awm.dtx"
so if it's another wepon just change the "Awm" to the wepon your modding
if there's space in it like "M4A1 Camo" i guess you have to put "New_M4A1_Camo.dtx"
or just make the picture smaller xD