Mac OS X: Double-Clicking a File Opens the Wrong Application - http://support.apple.com/kb/TS2291
=Changing the application used to open all files of a certain kind=
1) In a Finder window highlight a file of the kind you want to change the application to open that kind of file.
2) While that file is highlighted, select File > Get Info or press command (apple or propeller icon) + i to get a file information window.
3) In the lower part of the info window there is an "open with" menu with a list of applications.
4) If your application is already in the box then it is the default application for opening that kind of file and you don't need to do anything more. Close the get info window.
5) If the application showing in the menu is not the one with which you wish to open the file then select a new application. If your application does not appear there then select the "other..." and track down the application (usually in the Applications folder at the main level of the computer).
6) If you wish to change all files of this type to open with this application in future, make sure the "change all" button is selected.
7) Close the get info window.
Thanks for trying! I appreciate your effort to help!
Please note this, as stated in the O.P.:
I tried using the "Get Info" trick to change playback, but it only offers other applications in the apps folder. I cannot find an app named QuickLook anywhere on my system.
So, perhaps you can post something more that will help me get the functionality back to the way it was, the default of having QuickLook -- as part of Finder -- function for playback of .wav files.
I cannot find either a "Finder" app or a "QuickLook" app.
Do you know where to find them while using your "Get Info" trick? TIA.
I had a _lot_ of apps running and QuickLook seems to have bugged out.
I closed everything down and restarted, and QuickLook's functionality came back.
What is interesting, is that any and all .wav files that came into my system (via emails) during the time while QuickLook was 'away' are now permanently tied to iTunes instead of the norm. All other wav files from before and after, have the black icon that indicates QuickLook. The ones that were grabbed and played by iTunes in between, still have the iTunes icon.