Yesterday, after downloading a CDP, I accidentally mis-clicked so that it now opens with winrar. This doesn't allow it to go into the trainz DLS. Normally I would assume the answer is, "go into open with, and click on trainz". But Trainz is not an option given to me, even upon going under "more apps on this PC". How to I change it back so that they download for trainz? Every one I try and download will not work.