.001 (Indicates the first volume of a multi-part split archive).
Files with this specific naming structure are frequently found in: SS-JulSS-011_s.7z.001
Breaking down large installers for mirrors with file-size limits. SS-JulSS-011_s.7z.001
Often denotes a "small," "sample," or "sub-split" version of a larger set. 7z.001: Standard 7-Zip split-file format. Technical Analysis SS-JulSS-011_s.7z.001
Archiving large datasets or media collections.
The filenames must be identical except for the trailing numbers. If one part is renamed, the extraction will fail. Extraction Process: Right-click on the .001 file specifically.