If you provide this info, I can tell you if you should be using the rar command-line tool or if a simple right-click in Windows will do the trick. rar - ArchWiki
Right-click the folder or files you want to archive. Linsh.rar
Are you trying to create or turn multi-part files (.part1, .part2) into one ? If you provide this info, I can tell
Choose "Add to archive..." from the context menu. Configure Solid Option: If you provide this info
Adding or extracting single files from a solid archive takes much longer because the entire archive must be processed.