Ensure you have GGIW.7z.001 , GGIW.7z.002 , and any subsequent parts.
If you have all parts but the extraction fails, you may need to use a hex editor to check the Start and End headers or use a repair tool .
You must specifically right-click on the first file ( .001 ) and select "Extract" or "Open archive" using the 7-Zip GUI.
If the file was downloaded with a slightly different name (e.g., GGIW.7z (2).002 ), it will break the sequence. You must rename it to match the exact prefix of part .001 for the extraction to work.
To see what is inside, you must have all the related parts in the same folder: