Why XP SP3 does not support Windows XP

This title sounds a bit confusing. How can XP SP3 be developed for XP? Yes, Microsoft listed the supported system versions on the Windows XP SP3 overview page from XP RTM to SP2, but have you tried installing SP3 on RTM? If you tried it, you know that you can't install it at all, because you need SP2.

Why? Softpedia believes that this is because XP RTM has exceeded the support period on August 30, 2004. We can go from RTM to SP1 to SP2, or upgrade directly from RMT to SP2 before installing SP3. As for why upgrade from SP2 to SP3? In addition to the reason for the support period, SP2 is very special, because we know that Microsoft has released SP2 as a very significant update of XP, which means that SP2 contains a very important upgrade update, SP3 needs to run based on SP2. .