Can't open zip files

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I have downloaded 2 files, voip.GZ and voip.DS which contain firmware
upgrades for my Minitar MVA11A ATA box. However I can't find a way of opening
them. I've tried on my PC running XP, and on my Sony laptop running Vista,
but all I get is "Windows cannot open this file" and referred to the web
dialogue box.

I've tried 7-zip.org but it wanted 1 hr 20m to download, and didn't seem to
have any reference to .DS files anyway.

I've spent a day on this so far. Has anyone any advice they could offer and
which is simple for me to understand?

AllenH
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