Occasionally it might be convenient to see the Finder's Information WIndow for a track's file. At any rate, it will be more convenient to do so using this script:
tell application "iTunes"
set sel to selection
if length of sel is not 1 then return
set theTrack to item 1 of sel
if class of theTrack is not file track then return
set loc to (get theTrack's location)
if loc is missing value then return
tell application "Finder"
open information window of loc
Click the script icon to open this in the Script Editor.app on your machine. Save it named whatever you like as a "Script" in your ~Library/iTunes/Scripts/ folder so it will appear in iTunes' Script menu. Select a track (that has a local file), launch the script and the Finder will respond to you.