it is also a zip file
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it is also a zip file
Also remember, if you rezip the files, do not zip the containing foder, only the contents inside.
As mentioned by damned above this is also a zip file so change the .ppk to .zip and unzip it. However you do not need to do anything with any of the portraits packs unless you want to use one of the portraits for the GM Icon. It's assumed that you are creating your own image to replace the GMIcon graphic rather than using one of the supplied portraits.