How to use DA for searching in files on a local disk?

I sometimes have a large set of text files and a DEVONagent search set.

I want to apply this specific seach set to the set of files, to see which of the files contain the “right” information. (To give you an idea why I want to use this search set: the Secondary Query contains some 3000 elements.)

So my question seems to be “how to formulate the URLs that will point to these files?” or is this application of DA simply impossible?
Better solutions?

Regards,
Bob

The only workaround coming to my mind is to enable Personal Websharing and to copy the files to ~/Sites. Finally duplicate the search set and add the local URLs to the new set. However, only (X)HTML, plain text and feeds are supported.