: Ensure all numbered files are in one directory.

A file ending in is the second part of a split 7-Zip compressed archive. To open it, you must have all parts (e.g., .001, .002, .003) in the same folder and start the extraction process from the first file. How to Use Split Archives

: In rare cases, if a header is missing, expert users on SourceForge recommend using hex editors like XVI32 to script a fix for the first part.