Ensure all parts ( .001 , .002 , etc.) are in the same folder before trying to open them.
Based on the file naming convention, is part of a split 7-Zip archive (often referred to as a multi-volume archive). It is not a standalone file, but rather the second part of a larger, compressed archive. CAK.7z.002
Here is a useful guide on how to handle, use, and repair this specific type of file. 1. How to Extract "CAK.7z.002" Ensure all parts (