>>458
普通にいけるよ？

// Test01.rc
...
#define STR_A "A"
#define STR_B "B"
#define STR_AB STR_A STR_B
STRINGTABLE
BEGIN
50000 STR_AB
END

// Test01.cpp
static TCHAR buff[100];
case WM_CREATE:
LoadString(((LPCREATESTRUCT)(lParam))->hInstance, 50000, buff, 100);
MessageBox(NULL, buff, buff, MB_OK);
break;