Do you have of this archive, or are you seeing an error message when trying to open it?
The software will automatically pull data from .002 and .003 to rebuild the original files.
When you see a file ending in , it means it is the third piece of a larger split archive. The mention of a "solid feature" (Solid Compression) is a specific method used by 7-Zip to improve the compression ratio. Understanding Solid Compression
You must have Vi9v.7z.001 , Vi9v.7z.002 , and Vi9v.7z.003 (and any others in the sequence) in the same folder.