You could have downloaded XP Update Extender 1.0 from our software library for free. XPUpdateExtender.exe is the default file name to indicate the XP Update Extender installer. This free PC software is compatible with Windows XP/XP Professional/7/8/10/11 environment, 32-bit version. The program lies within System Utilities, more precisely System Optimization. This free program is a product of pXc-coding. The following version: 1.0 was the most frequently downloaded one by the program users.
From the developer:
XP Update Extender is a program that allows you to receive updates for Windows XP until 2019. Therefore, all it does is to set a registry key pretending to be a version of XP Embedded called "POSReady" and it does not modify any system files. Pretending to be running this particular version of Windows, you will receive updates made for exactly this version of Windows XP.
You may want to check out more software, such as ih-update Desktop Scoreboard, Reality XP Flight Line T for FS9/X or Mz XP Tweak, which might be similar to XP Update Extender.