Some burning software will make CD audio discs from MP3s on the fly. That does involve a format change.
But if the CD was originally ripped using Windows Media Player's Lossless WAV settings, the wave files will be 44.1kHz/16-bit the same as CD audio. There will be no loss if those files are used to create a new CD.
My suggestion was to try to figure out if the .wav files were burned to a data CD, or if they were formed into a proper audio CD.
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs