If you prefer the terminal, move to the folder and run: 7z x 430.7z.001 To help you further, I'd need to know: What are you using? Do you have all the parts (e.g., is there a .002)?

: This is the native tool for these files (Windows). Mac users should use Keka or The Unarchiver . 📖 Step-by-Step Guide 1. Gather the Parts

The file extension indicates that you have the first part of a split compressed archive created by 7-Zip .

Are you getting a when you try to open it?

: This usually means part .001 is corrupted or you are missing a piece. Check that the file sizes of all parts (except the last one) are identical.