I got the 32-bit build step for .asm files to work now. However, the x64 build does not work. It executes ml.exe in favor of ml64.exe. I included the correct bin directories for building x64 code ofcourse.
The compiler is VC10 for both architectures and it works fine with C and C++ code. However, the MASM compilation build step for x64 doesn't. The only difference between the command is using 'ml64' instead of 'ml'. What am I doing wrong?