/platform (C# Compiler Options)
Specifies which version of the common language runtime (CLR) can run the assembly.
/platform:string
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anycpu (default) compiles your assembly to run on any platform. Your application runs as a 64-bit process whenever possible and falls back to 32-bit when only that mode is available.
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anycpu32bitpreferred compiles your assembly to run on any platform. Your application runs in 32-bit mode on systems that support both 64-bit and 32-bit applications. You can specify this option only for projects that target the .NET Framework 4.5.
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ARM compiles your assembly to run on a computer that has an Advanced RISC Machine (ARM) processor.
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x64 compiles your assembly to be run by the 64-bit common language runtime on a computer that supports the AMD64 or EM64T instruction set.
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x86 compiles your assembly to be run by the 32-bit, x86-compatible common language runtime.
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Itanium compiles your assembly to be run by the 64-bit common language runtime on a computer with an Itanium processor.
On a 64-bit Windows operating system:
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Assemblies compiled with /platform:x86 execute on the 32-bit CLR running under WOW64.
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A DLL compiled with the /platform:anycpu executes on the same CLR as the process into which it is loaded.
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Executables that are compiled with the /platform:anycpu execute on the 64-bit CLR.
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Executables compiled with /platform:anycpu32bitpreferred execute on the 32-bit CLR.
The anycpu32bitpreferred setting is valid only for executable (.EXE) files, and it requires the .NET Framework 4.5.
For more information about developing an application to run on a Windows 64-bit operating system, see 64-bit Applications.
To set this compiler option in the Visual Studio development environment
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Open the Properties page for the project.
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Click the Build property page.
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Modify the Platform target property and, for projects that target the .NET Framework 4.5, select or clear the Prefer 32-bit check box.
Note /platform is not available in the development environment in Visual C# Express.
For information on how to set this compiler option programmatically, see PlatformTarget.
