How to build a filter handler for a custom file format so that its contents could be searched through the windows search?

I have started building a filter handler for a custom file format. I came to know that I need to implement the IFilter interface for that. Moreover, I got a sample from the internet which was doing just the needful. It registered the persistent handler for the custom file format in the regedit/classes_root. But still my custom files are not getting searched开发者_运维问答 through their contents. Any suggestions..

I haven't done this, but Developing Filter Handlers for Windows Search on MSDN seems like a good starting point.