Welcome to FixYa!
As I understand it, you have recorded some audio using your MP3 Player but the recording does not play in the computer.
Try to download and install VLC player from this link
http://vlc-media-player.en.softonic.com/ and open the recorded file with this program.
If it still cannot be recognized, try XP Codec Pack with MEDIA Player Classic
http://www.xpcodecpack.com/download
The recorded audio file is not being recognized by the computer because the "codecs" necessary to decode the audio file is not yet installed in your computer. The 2 free programs above installs the codecs and has it's own player to play your recorded file in the computer.
You do not need to install anything in your mp3 player.
If the above solution will not work, provide me with the file type of your recorded file so that we can find a matching codec for it or in worst cases, find a converter to that it will be recognized by your computer.
Thank you for using FixYa.
Have a great day.
Jas247