I think we have the issue there.
Try to do the following:
1. Select the .zip file, and don't press enter on it.
2. Press either the applications key or shift f10 to right click on the file.
3. Go down to "Extract files" and press enter.
4. Press enter once again to extract. Now, the Swamp zip file will be extracted into a new folder in the same location as the zip file. So if the zip file is called Swamp.zip, the new folder will be called Swamp. When you extract zip files in this way, you are sure that everything, folders and sub folders, are being extracted automatically.
I look forward to hear if this works for you or not.
Best regards SLJ.
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Happy gaming... :D