/platform (Visual Studio - JScript)
Specifies which version of the common language runtime (CLR) can run the assembly.
x86 compiles your assembly to be run by the 32-bit, x86-compatible common language runtime.
Itanium compiles your assembly to be run by the 64-bit common language runtime on a computer with an Itanium processor.
x64 compiles your assembly to be run by the 64-bit common language runtime on a computer that supports the x64 or EM64T instruction set.
anycpu (default) compiles your assembly to run on any platform.
On a 64-bit Windows operating system:
Assemblies compiled with /platform:x86 will execute on the 32 bit CLR running under WOW64.
Executables compiled with the /platform:anycpu will execute on the 64 bit CLR.
DLLs compiled with the /platform:anycpu will execute on the same CLR as the process into which it is being loaded.
For more information about developing an application to run on a Windows 64-bit operating system, see 64-bit Applications.
The following example shows how to use the /platform option to specify that the application should only be run by the 64-bit CLR on a 64-bit Windows operating system for Itanium.
jsc /platform:Itanium myItanium.js