Thanks, CLR - it works.
I guess I got confused by seeing
* Purpose : Generic Win32 application
...
#define WIN32_LEAN_AND_MEAN
in Main.c created by the wizard ;-
FWIW, I am testing IPC between 32- and 64-bit apps using RegisterWindowMessage & SendMessage. A single exchange of, well, two dwords eats around 11000 ... 17000 cycles, depending on the CPU. Results are very similar for 32- and 64-bit "servers".