The Eclipse plugin creation wizard allows to create OSGi bundles or Eclipse plugins.
The most notable difference is that the PDE plugin editor does not show the extension tab.
I recently wanted to use an plugin extension in a project which I initially created based on OSGi; therefore I wanted to enable the “Extension” and the “Extension Point” tab in the PDE editor.
To do this remove the line “pluginProject.extensions.false” from the file .settings/org.eclipse.pde.core.prefs. Re-open the “MANIFEST.MF” and the Extensions tab will show.