You cannot extract the "part01" file by itself. You must have of the sequence (e.g., part01.rar, part02.rar, part03.rar) in the same folder.
If even one part is missing, the extraction will fail with a "Missing Volume" error. 2. Recommended Software pack.part01.rar
Standard zip tools built into Windows or macOS often struggle with multi-part RARs. It is best to use specialized software: The original tool for this format. You cannot extract the "part01" file by itself
Ensure all files have the exact same base name before the "partXX" suffix. pack.part01.rar