A multi-part archive is a single file split into smaller pieces for easier downloading or storage. You cannot open "Part 4" until the previous parts are present.
Ensure you have sc23655-CK2DR.part1.rar , sc23655-CK2DR.part2.rar , and sc23655-CK2DR.part3.rar in addition to your Part 4. sc23655-CK2DR.part4.rar
Handling a file like indicates you are working with a multi-part archive . This specific file is the fourth segment of a larger data set, and you cannot extract it in isolation. A multi-part archive is a single file split