Convert Old Audio File

Years ago I recorded my young son singing a song with my Mac PowerPC. When I retired that computer, I copied the file and stored it on my PC for many years. Now I have finally emerged from the desert and am back to Mac (MacBook Pro). When I copied the file onto my MacBook, it appears as one of those black files with the green word EXEC in the upper left hand corner. The name/file extension is: Name.wav.dat

I would very much like to see if I can convert this into an audio file to hear that little boy sing again! (He's now 17.)

I downloaded Switch and tried every which way to convert the file into something usable but had no luck.

If any of you folks can help me, I'd be so grateful!

You may find some answers hear
http://www.ojosoft.com/how-to-conver...converter.html