: Ensure you have every segment of the archive.

Files with this naming convention are frequently used in or data leaks . In many recorded cases, archives following this "date-stamped" format contain: Malicious executables disguised as documents. Compressed database dumps from security breaches.

Do you have the (like .001 and .002 ), or are you trying to identify where this specific file originated ?

: The .003 extension indicates that a larger archive (likely named 15-09-2019.7z ) was broken into smaller pieces for easier sharing or storage.

: Before opening any extracted files, upload the archive to a service like VirusTotal to check for malicious signatures.

: Right-click the .001 file (the first part) and select "Extract." 7-Zip will automatically pull the data from .003 as it processes.