If you can share the or context of what you are extracting , I can tell you if you need a specific type of software to open the final contents.

This usually means one of the parts was downloaded incorrectly. Re-download the specific part causing the error.

Double-check that you have all files in the same directory.

Select or "Extract to [folder name]" using your software (7-Zip or WinRAR).

only on the first file (e.g., sc23323-ULOTC.part01.rar ).