He knew that without Part 3, the archive was a locked vault. You couldn't just open Part 2; you needed the whole "family tree" to reassemble the data.
: If you are on a phone, use the RAR for Android app to handle multi-part archives. Do you have the other parts of this archive, or BSXUBR.part2.rar
The notification blinked on Elias’s screen: He knew that without Part 3, the archive was a locked vault
A dialogue box appeared: Insert next volume: BSXUBR.part3.rar. He knew that without Part 3