Sorry about the delay in getting back to you.
I did a bit of fishing around, and no luck. The EWQL format is proprietary, and not a format for linux, or indeed, usuable in Linuxsampler. So it's a case of sticking to the Windows box for your EWQL stuff.
If you want to extract the samples, and convert them to "something", then SFZ may be your better option. Contrary to gig format, SFZ is simply a folder containing your samples, and a text file that you "play" to get the sounds going.
You'll need to build the SFZ yourself, and there's a bit of study involved, but it may give you a good long term result. Here's some reference material to get you started.http://www.cakewalk.com/devxchange/sfz.asp
You can of course build the gig file, if you choose that format, in gigedit, and again, there's a bit of work involved as you'll have to do this manually.