The "CS" at the beginning is simply the filename chosen by the person who created the archive (likely standing for "Creative Suite" or a specific game title), while the extensions define its structure. Key Characteristics of Split Archives
: When you "unzip" the first part, the software automatically looks for and combines all subsequent parts in the same folder to recreate the original large file. CS.7z.002
: You cannot open part .002 by itself. It is useless without at least part .001 . A complete set usually includes .001 , .002 , .003 , and so on. The "CS" at the beginning is simply the