Windows 7 Federated Search - How to make it send search requests to my .net assembly

Question

I am trying to display search results in the windows 7 explorer thru the federated search feature, from a local .net assembly. (not from a web service)

I have found various tutorials, but all of them are for web services. Earlier I thought that it was not possible but then, I came across the StickyNotes federated search connector. The contents of the .OSDX file are:

<?xml version="1.0" encoding="UTF-8"?>
<searchConnectorDescription xmlns="http://schemas.microsoft.com/windows/2009/searchConnector"&gt;
  <description>Create short handwritten or text notes.</description>
  <isSearchOnlyItem>true</isSearchOnlyItem>
  <includeInStartMenuScope>true</includeInStartMenuScope>
  <templateInfo>
    <folderType>{982725EE-6F47-479E-B447-812BFA7D2E8F}</folderType>
  </templateInfo>
  <simpleLocation>
    <url>StickyNotes://{S-1-5-21-3431700657-2522803235-1547684158-1000}/notes</url>
    <serialized>MBAAAEAFCAAAAAAAADAAAAAAAYUgAAQBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAAAAAAAAAAAAAAAAYKAUAwHAykg1PPWtiyRvmVorPeOnkJkAQEATBAdAkGAjBwaAkHAOBwbAQHAlBwcAoDAvAwLAsHATBQLAEDAtAQNA0CAyAQMA0CAzAANAMDAxAwNAADAwAgNAUDA3AQLAIDA1AgMAIDA4AAMAMDAyAwMAUDAtAQMAUDA0AwNAYDA4AANAEDA1AAOA0CAxAAMAADAwAQfA8CAuBwbAQHAlBwcAAAAAAAAAAAAAAA</serialized>
  </simpleLocation>
</searchConnectorDescription>

This means that it is possible to forward a search query to a local datastore/dll/exe

I would like to use my .net app to provide search results in the same/similar way. Where do I start?

See: Windows 7 Federated Search Provider Implementer’s Guide

My aim is to make a documents library database (sqlite) searchable via the windows explorer and list the files and their meta data from the DB in explorer (files are stored locally).