Just to let you know that the AMD64 packages indeed appear usable on the Windows 10 "thingy" (a.k.a. "Windows Subsystem for Linux (beta)" or better as "Microsoft-Windows-Subsystem-Linux" in powershell parlance - e.g. to install under elevated powershell run something like 
Get-WindowsOptionalFeature  -Online | ? {$_.FeatureName -like '*Linux'} | Enable-WindowsOptionalFeature -online
).
I was going to bootstrap one of these days pkgsrc under it, now I probably won't bother. 
The PKG_PATH is a little different from the one in the mail message, though - 
as well as the location of the bootstrap archive - 
Chavdar