This file is only a piece of a larger archive. To successfully extract it, you must have all subsequent parts (e.g., zwnd.7z.002 , zwnd.7z.003 , etc.) in the same folder.
Do you have the of this file in the same folder? 7z - Википедия zwnd.7z.001
The file is the first part of a split (multi-volume) compressed archive created with 7-Zip . Key things to know: This file is only a piece of a larger archive
You only need to open the .001 file. Most archive managers will automatically detect the other parts and join them together during extraction. zwnd.7z.001