You cannot open the .009 file individually because it only contains a portion of the total data. To extract the contents, you must:
A multi-volume archive is a single collection of files broken into several segments. N.7z.009
Each part is assigned a numbered suffix, such as .001 , .002 , up to .009 and beyond. You cannot open the
The software will automatically detect and "stitch" all subsequent parts together to extract the full original files. Recommended Software such as .001