The only way to do that would be if you store the files on your own server, then use our Send Stored Codes feature with thank-you email templating to assemble the URL for each buyer's file.
The product's list of Stored Codes would be a list of the filenames on your server, then you'd use the [%codes%] template tag in the Product Thank-you Email message to insert the buyer's filename at the end of a URL like so:
<a href="http://www.example.com/downloads/[%codes%]">Click here to download your file</a>
BTW, you'd also want to include a blank file named index.html in the folder where those files are stored on your server; this should prevent listing all the files in that folder if someone tries browsing to that folder without a specific filename at the end (e.g. http://www.example.com/downloads/ in the example above).
