The beginning of the filename usually serves as a unique identifier. In the context of internet distribution—particularly in the scenes of software sharing, gaming, or media archiving— SW often serves as an abbreviation.
Ensure you have parts 1 through 10 (and any subsequent parts) in the same directory. SW-953-u.part11.rar
If you can tell me the of this file (e.g., where you downloaded it or what software it’s for), I can help you identify exactly what features it adds. The beginning of the filename usually serves as