Recently, spotted the 64-bit compiler Dec Apla C, revealed the first 64-bit Windows NT compiler by tracking Microsoft Windows NT test versions as AXP64/ ALPHA64 porting. This update was provided by Neozeed, a software archaeologist in the VirtualFun community.
This is a test version of the 2000 system. The launch of the Platform SDK enables users to test and compile Win64 code, which is compatible with 64-bit code types, and pre-beta IA64 and ALPHA64 compilers.
Now, Neozeed shared that it is hard to run this compiler and cannot test 64-bit Windows 2000 systems.
Sundown is the code-named of the Win64 project of AXP64 and IA64, though Microsoft never released a 64-bit version of Alpha AXP Windows.
At Last, as per reviews from the people, this could be a beta version of WinXP.