I've met with situations, when rar splited archives have .r00 .r01 .r02 etc extension.
And the only way to open that archive is to click on .rar file wich is usually on the bottom of the window.
When i will klick on any other file, and choose, unpack with keka, i shall receive an error.
Operation failed with error code 2
Many windows archivers, including 7zip recognise those files as rar segmented archive part, and can unpack it, regardless what file will i klick.
Thanks for the concern.