Kind of? It's only kind of secure because of how freaking old it is. That way, your file order can be carried over between machines without issue. Vista and up, unfortunately Bill Clown Gates removed the manual files arrangement which I can't live without it
Linux probably has a drop-in replacement for most if not all of them. Linux is a joke if it doesn't support 100% of all my software utiities. A ton of XP era applications and games won't even utilize all that memory anyway, so it's a waste of time, even if it does work. If it works fine for you, alright then, but regardless, it should not be recommended to users who are new to XP or who simply just want a nostalgia box. The problematic client driver ecosystem led to the decision for client SKUs to ignore physical memory that resides above 4GB, even though they can theoretically address it.
Server systems commonly have more generic devices and with simpler and more stable drivers, and therefore hadn't generally surfaced these problems. As a result, the drivers truncated such addresses, resulting in memory corruptions and corruption side effects. What they found was that many of the systems would crash, hang, or become unbootable because some device drivers, commonly those for video and audio devices that are found typically on clients but not servers, were not programmed to expect physical addresses larger than 4GB. Windows XP SP2 also enabled Physical Address Extensions (PAE) support by default on hardware that implements no-execute memory because its required for Data Execution Prevention (DEP), but that also enables support for more than 4GB of memory.
However, by the time Windows XP SP2 was under development, client systems with more than 4GB were foreseeable, so the Windows team started broadly testing Windows XP on systems with more than 4GB of memory.
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