Permission denied for adb push file to /data/data/xxx/file/
If you have a developer ROM, or in any way you have "su" enabled, you could copy to the SDcard and then use the shell:

adb push d:\save.bin /sdcard/.
adb shell "su @ cp /sdcard/save.bin /data/data/com.square_enix.android_googleplay.FFIII_GP/files/save.bin"