thanks for the link.
I have missed this one...

in fact, what I want to do is to index some content in an SQL Server
database and provide a quick access through the Desktop Search tool.
For example, the user type the name of a customer, then in the result I'll
see the email etc... but also the link to a content (a report or a webpage)
about the sales for this customer (or anything else).

Today the desktop search display the results grouped by type of content,
communications, pictures, etc...

So from here I want to add a section "Databases Info" and the different
results found for what the user looking for.

Maybe there is another way to do this?