In Mac os x would it not make sense to allow not currently open documents to come onto the dock? Why is this not part of the UX?
closed as not constructive by ChrisF, Matt Obee, JohnGB, alexeypegov, Benny Skogberg Mar 17 at 20:06
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I may not be fully understanding the question; so, I will try to answer with my interpretations of it.
In a nutshell, you can add individual, unopened files to the Dock - the same way we add just about anything to the Dock - and remove it the same way. However, the primary purpose of the Dock is for Applications and Directories (the Trash being a directory itself) - http://support.apple.com/kb/ht2474 - not individual files (the Dock would/could get very cluttered, very quickly - not good UX).