Post it here, instead of the "Missile" section, as it's still the only information I've found
and it bascally was a kind of a glider, developed in co-operation with Alexander Lippisch:
Developed during 1941, was a guided glide bomb of wooden construction, designated
"FG 03". The glider was test dropped from the Bf 161 V-1 and reached a rabge of about
20 km from a height of 4,000 m, but the second drop resulted in a total crash and the
program seem to have been stopped soon.
(from „Typenkompass – Deutsche Raketen und Lenkwaffen“ by Manfred Griehl)