Depends what you mean by "retrieve the file". You can certainly read the contents of the file. But if you want to know the name and location of a file, there doesn't seem to be any way to do that. If you really need to find the file name, and have no other way to do this, I suppose you could read in the contents, and then search the file system for a file with the same contents. (Similar to using grep or find in Unix.) But this is pretty ugly. I'd strongly recommend a redesign of some sort so you don't have to do this.
"I'm not back." - Bill Harding, Twister
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com