I'd like to write an import driver that will allow my proprietary file type to show up in the import wizard "Data Source" dropdown for SQL Server 2005 (or any version of SQL Server, for that matter). I see other vendors who've added their formats to this list - is there documentation for how I would put a driver together? I've searched MSDN and Google and I can't seem to turn up any leads, though it's clearly out there somewhere. Thanks!

**CLARIFICATION**: I want to add some detail to what I'm looking for. I'm a vendor, and I want to provide my clients a way to import files directly into SQL Server from my custom format. In this image ([Flickr Link](http://www.flickr.com/photos/97207635@N00/3133335987/)), you can see that Gupta has added a "Provider" in this list that appeared when I installed their client tools, just like Oracle (or many other companies) add a provider for their data sources.

How can I add one for my custom data source type? I want "Ryan's 123-Base" (or whatever my product name is) in that list so that clients can import directly from my company's format?