To understand the file, you have to decode the four specific attributes in its name:
This refers to the partition style. "A/B" devices have two sets of partitions (Slot A and Slot B) for seamless updates. This image is designed specifically for that layout.
Use a tool like 7-Zip or WinRAR to extract the .img from the .xz archive.
Note: Modifying your system partitions carries risks. Always back up your data.
The .img is the raw flashable file, and .xz is a high-compression format used to make the download smaller. Why Does This Exist? (Project Treble)
Before Project Treble, developers had to build a custom ROM specifically for every single phone model. Treble changed this by separating the Android OS (System) from the hardware-specific code (Vendor).
The system-arm32-binder64-ab.img.xz is a specialized tool for a specific subset of Android devices. It represents the bridge between aging hardware and the latest software features. For enthusiasts owning budget-friendly or unique hardware configurations, it is the primary way to keep a device relevant long after official support has ended.