This indicates the final state of the file after the xdelta instructions have been applied to the original data, resulting in a fully updated game client. Why Use Delta Updates?

Instead of downloading many gigabytes for a full update, an xdelta patch might only be a few hundred megabytes.

How to create and use Xdelta patches - Ninten's Corner - WordPress.com

An open-source tool and algorithm used for binary diffing and delta compression. It compares two files—the original version and the target version—and generates a small "delta" file containing the differences.

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