All you have to do to open the archive is to double click it. Once you do that, it opens up and you will see the "GWX-Dec 23rd Corrections" folder (one folder) in the file manager window. Make sure the folder is highlited and click 'Extract'. The next window will show you where it will be extracted to. If it isn't showing the right path and location, you can browse to the mod folder. Click (highlight) the 'Mod' folder and select ok. Once you've done that, you'll see this path in the 'Copy To' window: C:\Program Files\Ubisoft\SilentHunterIII\MODS\. Select ok and the folder will be copied to that location.
If you don't understand that, you can always manually copy and paste it.
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