I think that the Edit in Paintshed in TS2009 only works on Paintshed assets. The best tutorial on reskinning is the one at World of Trains. It is made for TRS2004 so the instructions for file accessing don't apply but otherwise it should help. Get it here http://www.worldoftrainz.com/Pages/Tutorials_TRS2004/Reskin/ReskinChapter1TutTRS.htm
Bob
Bob