BB Bold :: Linking To File On SDCard From Tasks?

I would like to access a file on my SDCard directly from a link in the Notes section of my Tasks application.

I am able to put a link there and access a web page, simply by typing a web address (e.g. http://www.sample.com), which converts to a link after I close and re-open the task. From an open browser window, I am also able to access a file that exists on my SDCard (e.g. file:///SDCard/BlackBerry/documents/sample.pdf will go fetch the file and then open my default PDF reader just as it ought to). But when I type "file:///SDCard/BlackBerry/...etc..." into the notes section, it remains as text, and does not get recognized as/ converted to a link to the file.