Re AMD64
If you look at Windows 10 update history you will see both the x 64 and AMD64 descriptions used. Technically the instruction sets are very similar and developers have used AMD64/x64 interchangeably to mean the application code is compatible with 64 bit processing.
https://en.wikipedia.org/wiki/X86-64
"Industry naming conventions
Since AMD64 and Intel 64 are substantially similar, many software and hardware products use one vendor-neutral term to indicate their compatibility with both implementations. AMD's original designation for this processor architecture, "x86-64", is still sometimes used for this purpose,
[2] as is the variant "x86_64".
[3][4] Other companies, such as
Microsoft[6] and
Sun Microsystems/
Oracle Corporation,
[5] use the contraction "x64" in marketing material.
The term
IA-64 refers to the
Itanium processor, and should not be confused with x86-64, as it is a completely different instruction set.
Many operating systems and products, especially those that introduced x86-64 support prior to Intel's entry into the market, use the term "AMD64" or "amd64" to refer to both AMD64 and Intel 64."