: Ensure you have downloaded all related segments. If you only have the .001 file and try to extract it, you will likely receive an "Unexpected end of data" error.

: You need a third-party archiver to handle .7z formats, such as:

: Right-click the .001 file and select Extract . The software will automatically find the other parts in the folder and combine them into the final file. Security Warning How to Open and Extract .001 Files - Microsoft Q&A

: The official tool available at 7-zip.org . The Unarchiver (Mac) : Available on the Mac App Store . ZArchiver (Android) : Available on the Google Play Store .