Think Subspace isn't popular anymore? dl the game and see for yourself : ) There's a newer, re-developed version called Continuum which has more handy features but also some untimely bugs every now and then, so the choice is up to you.
To get to Wing Commander Zone, click on Find Servers in Subspace or the Zone button in Continuum and look for ExSF Wing Commander, add it, and you're set : )
And Wild .... The soundset file is still not there ... check your spelling or whatever that's messing it up : P
-pen