If you are having problem on installing these files into your S60 3rd
edition SDK emulator,
then you could get some help from the Forum
Nokia Technical Library.
Y-Browser plug-Ins
Y_Browser_PlugIns_Definitions.doc
will explain to you on how you can can make your own Symbian Eco
plug-in extensions to the Y-Browser file manager.
If you prefer reading it as a Web page, then follow this
link.