4GB OR only 2.2GB for single 32bit application in 64bit windows with 4GT and LARGE_ADDRESS_AWARE set?

Question

Hello,
Recently I used a software requiring a large memory. And I have tried to allocate more memory for this application, and I find some interesting phenomena which is different from the case I searched from Internet. Therefore, I am very curious about the mechanism
of memory management of WoW64.
With default setting, my application can only apply for 1.6GB memory (less than 2 GB barrier). And I use increaseuserva command by BCDedit, and it worked. With this setting, it can apply for 144 MB more memory (far less than 3 GB described on MSDN https://msdn.microsoft.com/en-us/library/windows/desktop/aa366718(v=vs.85).aspx).
And then I modified the PE headers to add a LARGE_ADDRESS_AWARE flag, and it worked. The limit was changed to be 2.2GB, and it is far less than 4GB as they said!
What happened? How can I increase the limit to 4 GB? 
I have tried two systems 64bit Win7 home premium and 64bit Windows10 TP. 
Could anybody tell me what is the problem is?

Answer 1

I'd try them over here.
http://answers.microsoft.com/en-us/windows
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]
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