The exact contents are unknown without extracting the file. It could contain anything, such as a dataset, game files, documents, or media.

7zip file with numbers on it like 001 means that you only have a part file of the whole compressed file. Microsoft Learn How to Open and Extract .001 Files - Microsoft Q&A

Do not attempt to open only the first part, as it will likely appear empty or corrupted.

The file indicates that a larger dataset, software, or collection of files (possibly named "SS-Nin-030_s") was broken into smaller, numbered parts (e.g., .001, .002, etc.) to make downloading or transferring easier.

To view or extract the contents, you need all parts of the archive (e.g., 001, 002, ...) in the same folder.

To help you further, do you have the other parts of this archive (like .002 , .003 ) in the same folder? How to Extract .7z.001 files - Microsoft Q&A

You must use 7-Zip or WinRAR to open the first file (.001) and extract the entire content.