Unity3d+Android, Get path of Assets/Plugins/Android directory

I want to find the path of Assets/Plugins/Android directory.

I have tried string filePath = Application.streamingAssetsPath; But it gives path like jar:file:///mnt/asec/com.cmpny.pkg-2/pkg.apk!/assets

Goal: I want to check programmatically whether a particular jar (abc.jar) file is is present or not. Kindly help me to find that. I have placed the jar file here (AppName\Assets\Plugins\Android\abc.jar) I would appreciate any help. Thanks.