Change the default program for an audio file type with Vista.

Change the default program for an audio file type with Vista.

Open Control Panel.

In Control Panel Home, click "Programs", and then click "Make a file type always open in a specific program".  (Or, in the Classic View, open "Default Programs and then click Associate a file type or protocol with a program".)

Highlight a file type in the list and click "Change Program".   From there you should be able to associate Express Scribe to .wav and .wma files.