WMA files can be converted to WAV files using an online file converter. Upload the desired WMA file from your computer, select WAV from the output options, then click the Convert button. Some converters allow the direct download of converted files, while some send them to a specified email address.
WMA and WAV are both formats for audio files used primarily with Windows Media Player. WMA files are compressed while WAV files are not, so WAV files tend to be quite a bit larger. However, WAV files are of higher quality, so they are often used for first-generation archival copies of audio broadcasts.