: All files must have the exact same base name. If one is named AB.7z.004 and another is AB(1).7z.001 , the software won't recognize them as part of the same set. Rename them so they match perfectly.
: Ensure you have every numbered part of the set (AB.7z.001, AB.7z.002, AB.7z.003, and AB.7z.004) in the same folder . If any part is missing, the extraction will fail. AB.7z.004
: You do not interact directly with the .004 file. Instead, right-click on the first file in the sequence ( AB.7z.001 ). : All files must have the exact same base name