Install XP from USB

Just curious, has anyone figured out how to create an XP USB installation medium that doesn't rely on some third party software?

I'm pretty sure just creating a boot sector on the USB and copying XP setup files to it doesn't work...
 
I can create a usb bootable installation, but have to use rufus. So , no, I have not figured out how to do this without a third party program. :)
 
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