To access the files inside, you must have all parts of the sequence in the same folder.
: Ensure you have FCSI.7z.002 , FCSI.7z.003 , etc., as the extraction will fail if any part is missing. Open the first part : Right-click on FCSI.7z.001 . FCSI.7z.001
While "FCSI" could be a custom name chosen by a user, it most commonly refers to: How to extract part files 001 using 7zip on windows (2026) To access the files inside, you must have