Newbie, No sound from WAV file in Media Player playlist

Hi I am new, have spent all day reading and looking for answers. Running Windows 7 and Audacity 2.0.3 After soome trail and error I was able to copy music from cassette tape too Audacity. It plays fine while the file is within Audacity. After I exported it to my library and then put it in Window Media Player playlist it will not play. It will burn to a CD, show the file name and size but will not make a sound. Help please. Jim

If it’s a USB cassette player, disconnect it from the computer: .