I have been sent a music track as an .mp3. However, it would not play using the laptop running Windows Vista and Windows Media Player. A quick Google suggested that my version of WMP version 11.0.6002.18311 does not play .mp3’s BUT all my music is in .mp3 and they all play.
I tried it on the old desktop PC running Windows Xp and Windows Media Player version 11.0.5721.5280 and guess what, it plays ok.
So, I imported the new mp3 into Audacity and re-saved it as an mp3 and now both versions on WMP work.
The question is why?