Visual Studio 2010: X64

#ifdef _WIN32 // Defined for both 32-bit and 64-bit #endif

Here is the feature summary and technical details for specifically for x64 (64-bit) development . Visual Studio 2010 X64

#ifdef _WIN64 // Targeting 64-bit (x64 or ARM64) #endif #ifdef _M_X64 // Specifically x64 (not ARM64) #endif #ifdef _WIN32 // Defined for both 32-bit and

If you need help setting up a specific x64 project type (DLL, driver, .NET app) in VS2010, let me know. .NET app) in VS2010