You can only convert kma to wav in real time through sound card while playing in Hoster with perhaps some loss of quality. This would take forever to do and I would not even be worth trying unless you only wanted to do a few. But if you have the kma's you should have the discs and using the discs would be easier than using the kma. All you would have to do is extract the wav file form the disc. This would be mucho quicker and cleaner.
There are lots of software programs out there to do that with from $30 to several hundred dollars.
Hope this helps!
wallymeister
