C-w.7z.001

: This specific file is only the first piece of the complete data set.

A file with the extension is the first part of a multi-volume split archive created with 7-Zip . Large files are often split into smaller numbered segments like this (e.g., .001, .002, .003) to make them easier to download or share. Key Facts About c-w.7z.001 c-w.7z.001

Extracting a zip file - IT-Helpdesk - University of Helsinki : This specific file is only the first

: You cannot extract the full content without having all accompanying parts (c-w.7z.002, c-w.7z.003, etc.) in the same folder. c-w.7z.001

: The .001 file acts as the header or index that tells extraction software how the data is reconstructed across the subsequent parts. How to Open or Extract