Why are my LimeWire Mp3 files saving as m3u?

Your Limewire MP3 files may be saving as M3U because M3U is a playlist format that contains references to audio files rather than the actual audio data. When you download music, LimeWire might be creating a playlist file that points to the location of the MP3s instead of saving the MP3 files themselves. To resolve this, check your download settings or the file types you're downloading to ensure you're saving the actual audio files.