\e$B8=:_%+!<%=%k$,$"$k9T$N%a%C%;!<%8$,\e(B
MIME \e$B$G%+%W%;%k2=$5$l$?J#?t$N%a%C%;!<%84^$`>l9g!"\e(B
\e$B$=$l$i$r8=:_$N%U%)%k%@$K$[$I$-$^$9!#\e(B
+\e$B=q$-9~$_IT2D$N%U%)%k%@$K5o$k>l9g$d\e(B prefix argument \e$B$r$D$1$F<B9T$7$?>l9g\e(B
+\e$B$K$O!"E83+@h$N%U%)%k%@$r?R$M$^$9!#\e(B
(@code{wl-summary-burst})
@item @@
If the message at current cursor point has
encapsulates multiple messages using MIME,
de-capsulate and extract them on the current folder.
+If it is invoked in non-writable folder or it is called with prefix
+argument, it asks the destination folder.
(@code{wl-summary-burst})
@item @@