WMA won't play in WMP



I’ve created a mix of songs in nero soundtrax using the linear crossfade option. I saved it as mp3 but couldn’t play it. I saved it as wma but now I can only play it in nero showtime whereas i want it in WMP with the rest of my music. Can anyone help. PS the original files were wma and played in WMP but now WMP is saying ‘cannot play files as they are incomplete or corrupted’ or something like that.