You must have Vi9v.7z.001 , Vi9v.7z.002 , and Vi9v.7z.003 (and any others in the sequence) in the same folder.
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 Vi9v.7z.003
Do you have of this archive, or are you seeing an error message when trying to open it? You must have Vi9v
Since this is part 3 of a set, you cannot open it by itself. To extract the contents: Understanding Solid Compression Do you have of this
Use 7-Zip or WinRAR to open only the .001 file.
The software will automatically pull data from .002 and .003 to rebuild the original files.
It significantly reduces the size of the archive, especially when compressing many similar files.