For the uninitiated, seeing a .001 at the end of a file can be frustrating. It means you’re looking at the first "slice" of a 7-Zip split archive. To actually see what’s inside, you’ll need all the subsequent parts (002, 003, and so on) in the same folder before your extraction software can stitch them back together.
The _v in the filename suggests this might be a specific version or a "vetted" release of a larger project. SS-KatSS-001_v.7z.001
Archives this large often come with a .sfv or .md5 file to verify that no data was corrupted during the download. For the uninitiated, seeing a
Right-click the .001 file specifically; the software will automatically detect the other parts to complete the extraction. For the uninitiated