This is a now abandoned project done by win32 and Ximonite mostly in private, and was never released anywhere. I've decided to finally release all that there is regarding the project. It's very much still in the infancy stage, and x64 versions of Roytam1's Firefox 52+/UXP based browsers are broken by it, but it allows you to run various programs that XP can't normally run.
Some examples are:
Ripcord:
Requires you to go to regedit and go to "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders", and change the Local AppData folder to a shorter directory to properly work
Steam (October 7, 2020 build):
Requires this build of Steam with the XP mod applied. Also only usable in small mode.
It can probably run more, but I can't remember much else because it's been so long. It's very close to being able to run Java 16 (AdoptOpenJDK-jre Openj9) on XP, but there's always this access violation error that prevents it from working. A couple of the dlls need to be modified with CFF Explorer, but I can't remember which currently. You also need to modify the installer with Orca for it to install.
The kernel files are attached below. To install it, you need to boot into a Linux boot CD, drop the folders in the .zip in the Windows directory, and then delete dllcache from the Windows directory, and reboot into XP.
Warning: You must be updated to the Server 2003 EOS or else this will break XP.