This item is a Shared Library.
Extension Overload does not have any information about a file with this name. 
Shared Libraries are commonly identified by name, with many files having the same creator and type.The report highlights the items that it has no information about. If you know what some of these items are and do then you can help by sending a short description. This will be most appreciated.

Thank you. The Extension Overload Team.

             Email EO@kagi.com