Use this code in an Applescript to create a file handler that will allow you to click on urls of the form "finder://~/Dropbox/Project/Documents" to open that location in the Finder.

finder-file-handler.applescript

on open location this_URL
	-- passed paths should be "finder://[/path/to/directory]
	-- spaces in path names should be replaced with a url-friendly '%20'
	set x to the offset of ":" in this_URL
	set passed_path to text from (x + 3) to -1 of this_URL
	set my_path to do shell script "echo \"" & passed_path & "\" | awk '{gsub(\"%20\",\"\\\\ \"); print}'"
	do shell script "open " & my_path
end open location