Splitting files into parts like a1029.7z.004 is a common practice for:
: If you only have the .004 file, it is effectively useless. You must locate parts .001 through .003 . a1029.7z.004
: Older storage formats like FAT32 cannot handle individual files larger than 4GB. Do you have the other parts of this file, or Splitting files into parts like a1029
: Standard Windows "Extract All" tools often cannot handle split 7z volumes. It is best to use the official 7-Zip client . Why Do People Use This Format? a1029.7z.004