Why does linking to WAV files breaks my RSS feed

First, I recommend using the newer feed validator at https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Ffeeds.feedburner.com%2FTheGadgeteer it’s the successor to the original one.

Next, the issue appears to be how the WAV files are being enclosed. This is not a problem in WordPress itself, so it appears to be something Feedburner is doing, and I recommend contacting their support about it.

Thanks. I think you’re right about feedburner. It doesn’t seem to break using my regular feed at: https://the-gadgeteer.com/feed/