The above date stores the last time new Play Coin(s) were obtained. The contents of this file is updated by home-menu. [[PTM:GetTotalStepCount]] is not checked constantly, after home-menu boot this is only checked when waking from sleep-mode. Each time home-menu updates the contents of this file, home-menu will set the Play Coin total to 300 if it's higher than the 300 Play Coin limit.
Home Menu loads / opens this archive during startup, when this is corrupted(or at least on older system-versions) the result is a brick.
=== Tools ===
* [https://github.com/ps3hen/ctr_toolkit/tree/master/extdata_tool extdata_tool] - Extract/verifies standalone extdata images and title extdata FS.