FLY is FUN

Hi
I have just imported a txt-file with waving window bounderies, but they are not shown.
But if I change the Airspace class from W to C it's shown.

Example:
* Whiskey
AC W
AN Whiskey
AL 760m MSL
AH FL95
DP 60:30:42 N 015:00:18 E
DP 60:27:39 N 015:13:21 E
DP 60:20:57 N 015:22:53 E
DP 60:14:05 N 015:08:15 E
DP 60:14:15 N 015:06:34 E
DP 60:15:58 N 015:07:28 E
DP 60:30:42 N 015:00:18 E
*

* Whiskey
AC C
AN Whiskey
AL 760m MSL
AH FL95
DP 60:30:42 N 015:00:18 E
DP 60:27:39 N 015:13:21 E
DP 60:20:57 N 015:22:53 E
DP 60:14:05 N 015:08:15 E
DP 60:14:15 N 015:06:34 E
DP 60:15:58 N 015:07:28 E
DP 60:30:42 N 015:00:18 E
*