Kwave is able to handle several meta information that is stored within an audio file. It tries to import and export as much of that information as possible. For example, if you import an MP3 file with ID3 tags, you can keep that information when exporting to a Wave file. If Kwave would lose meta information when saving, it shows a warning.
You can view and modify the meta information under → . There you can also change things like sample format, resolution and compression.