The mention of "x64" is crucial. Most stripped operating systems of the 2008–2012 era were 32-bit (x86) because 32-bit software is generally lighter on memory addressing. A 64-bit (x64) version of a stripped OS is more complex because it must retain 64-bit driver support and core kernel binaries, which are larger than their 32-bit counterparts.
Originally developed by a modder known as "eXPerience," it famously reduced the operating system's footprint to fit onto a standard 700 MB CD-R. tiny 7 x64 free