A1029.7z.004

7-Zip will automatically recognize that parts .002 through .004 are present and combine them into the original full file. Troubleshooting

Use the 7-Zip tool. Select "Extract Here" or "Extract to 'a1029'/" from the 7-Zip context menu. a1029.7z.004

Right-click only on the first file (the one ending in .001 ). Extract: 7-Zip will automatically recognize that parts