Winamp will convert mp3s to .wav.
In winamp go to options, then preferences, then output (which is under plug-ins), then select nullsoft disk writer plug-in, then click configure and select an output folder. Hit ok. Now select the mp3s you want to convert by selecting from the file menu (top left or right clicking in the main window) play, then file, and open the location where your mp3s are at, you can select multiple files by hodling ctrl while clicking on the files. Once you've selected the files you want hit play and the files will be converted to .wav files to the folder you selected when you configured the output. Sorry for the long instructions, but I think that's it.
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