The software will automatically detect and join the other parts to recreate the original file.
Do you have the of this archive (like the .001 file) in the same folder? 18ss20220505_014200.7z.002
This indicates that this file is the second piece of the sequence. You will almost certainly need the first piece (ending in .7z.001 ) and any subsequent pieces (like .003 ) to open the content. The software will automatically detect and join the