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When installing an APK, it automatically extracts the libraries of the right arch type and has them available for System.loadLibrary. But, if you're trying to load a non-standard library, the installer won't know your app has 32bit native code.
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java.lang.UnsatisfiedLinkError: Expecting an absolute path of the library: jni_winx64
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)