Download and install the 64-bit version of WinRAR from rarlabs.com .
Are you trying to or are you working in a specific software ? Is "21928" a file name, a document ID, or a code? 21928 rar
Based on your request, it seems you are trying to create a (possibly named 21928.rar). The best way to do this is by using WinRAR on Windows or a similar archiving tool. How to Create a RAR File (Windows) Download and install the 64-bit version of WinRAR