: This is the "Base Name." While it varies by source, "SS" often refers to "Screencast," "Software," or "Screenshot" in specific archival communities. "IsaSS" is frequently associated with specific database dumps or game-related archival projects found on sites like the Internet Archive. _v : Likely denotes a "Version" or "Volume" marker.
: This identifies this specific file as the third part of a larger sequence. Technical Breakdown of the Filename SS-IsaSS-003_v.7z.003
You cannot open part .003 on its own. To access the data inside, follow these steps: : This is the "Base Name