java - "Eclipse-BundleShape: dir" header is not working and still the plugins are exported as JAR's -

i'm having eclipse indigo (3.7) , have bundleshape header being set in manifest.mf of plugin.

eclipse-bundleshape: dir 

if export product still exporting plugin jar , not directory.

note : project plugin based project.

anything i'm missing ??

suggestions welcomed..!

is product feature based? if so, can set "unpack plug-in archive after installation" option in feature.

• open feature.xml file
• switch "included plug-ins" tab
• select plugin should in directory instead of jar form
• check "unpack plug-in archive after installation" on right side

@ eclipsesource says: "the feature win. if feature isn’t available or unpack attribute isn’t specified, bundle consulted shape."
http://eclipsesource.com/blogs/2009/01/20/tip-eclipse-bundleshape/

reason why bundleshape header ignored unpack="false" attribute in feature.xml.