: Right-click specifically on the file ending in .001 . Use 7-Zip to Extract : Hover over 7-Zip in the context menu. Select Extract files... or Extract Here .

Are you trying to a file you downloaded, or create a new archive for someone else? Do you have all the other numbered parts (002, 003, etc.)?

If you were looking to a new split archive with this specific name instead, you can do so by selecting a file, choosing Add to archive in 7-Zip, and setting the Split to volumes, bytes option to your desired size. To help you further, could you clarify: