If you are looking for specific contents within that file (such as the Canon case study), I can try to help you find similar information. a corrupted RAR file? What is a RAR file? RAR file information - BitZipper
If you receive an error, the file may be corrupted or require all parts of a multi-volume set, although the original post does not explicitly indicate it is a multi-part archive. 21994.rar
Always scan downloaded RAR files with antivirus software before extracting them. If you are looking for specific contents within