It should use wav over wma if available. If I recall correctly you can even convert the wma to a wav and it will use that if available.

You could always test it (if you can hear the difference).
Listen to a wma and then listen to the same wav. Note any difference you may notice.
Generate that realtrack and listen to it.

Many do not realize you can 'play' those wma and wav files in most mediaplayers .. that's how I discovered that at the end of many RealDrums there are individual recorded hits of each drum. So if you want to add a cymbal at X point in a song, you can do it. Not sure why this isn't the rule for all of the Realdrums and a feature mentioned by PGMusic somewhere.
To me that was a huge discovery. It means I can open a sampler and have the same Realdrums sounds yet customize them when needed.

/add a second snare hit .
// add a ride cymbal on on the beat ..
///slashies come in threes ...



I do not work here, but the benefits are still awesome
Make your sound your own!