Had a minute, the [SEPARATOR] doesn't work, but leaving a hint missing (note no Hint 02 below) produces a line, see image.
[ARCWALON]
DropDownCount=26
Icon=ARCWALON
Hint00=Walls by Center
Icon00=DTB_WallByCenter
A00=^;^»^
Hint01=Walls by Sides
Icon01=DTB_WallBySide
A01=^;^¼^
Hint03=Change item to Solid Line @ 5000
Icon03=S_Solid
A03=^;^F0^F0^S0^F8^F1^S1^5000$^F1
Hint05=Draw Dashed Nosing @ .2 Blue
Icon05=nh-lt Hidden
A05=^;^S7^S8^.4$^Dashed$^S7^Blue$^S0^
Hint06=Draw Dashed Upper @ .8 LtCyan
Icon06=nh-lt Footing
A06=^;^S7^S8^.8$^Dashed$^S7^LtCyan$^S0^
Hint07=Draw Dashed Overhang @ .16 Lt Cyan
Icon07=nh-lt Ceiling
A07=^;^S7^S8^.16$^Dashed$^S7^LtCyan$^S0^