This specifies the CPU architecture. The ARMv7 processor design is a 32-bit architecture that dominated mobile devices in the early-to-mid 2010s. Modern devices use 64-bit (ARM64), which cannot run on older chips, making this 32-bit version essential for older hardware.
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Netflix 4.16.3 Build 15172: The Essential Version for Older Android 4.4+ Devices
The complex string of numbers and terms in the file name tells you exactly why this specific file works where others fail.