Without more context about what you're looking to understand or accomplish (e.g., how to play, where to find more information, etc.), it's challenging to provide further specific guidance. However, this breakdown should help you understand what the filename implies about the file's contents and nature.
: This is the unique content identification code. Archivers and database managers use these numerical strings to index files without relying on lengthy, language-specific titles. FC2-PPV-3061625-1-4K.part23.rar