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    <p>You must be talking about the output you see from Dumpbin.exe with the /headers option. Which looks like this when run on a .NET assembly that's compiled with the platform target set to AnyCPU:</p> <pre><code>Dump of file ConsoleApplication1.exe PE signature found File Type: EXECUTABLE IMAGE FILE HEADER VALUES 14C machine (x86) 3 number of sections 4E3E987F time date stamp Sun Aug 07 08:51:59 2011 0 file pointer to symbol table 0 number of symbols E0 size of optional header 102 characteristics Executable 32 bit word machine etc.. </code></pre> <p>Yes, the IMAGE_FILE_HEADER.Machine value is set to 0x14c, the value of IMAGE_FILE_MACHINE_I386 (aka x86). This is of no consequence, perhaps the strongest hint that it is not relevant is the target name: AnyCPU. It runs as well on an x86 as on an x64 operating system.</p> <p>What you really want to use is corflags.exe, it shows you the COR header in the file:</p> <pre><code>Version : v4.0.30319 CLR Header: 2.5 PE : PE32 CorFlags : 1 ILONLY : 1 32BIT : 0 Signed : 0 </code></pre> <p>The 32BIT flag is the important one, 0 indicates that AnyCPU was used. ILONLY = 1 indicates that the assembly contains IL only, no machine code. It will be 0 when you create assemblies with the C++/CLI language.</p> <p>You <em>can</em> create an image file with the machine set to x64. I think that was introduced in .NET 3.0 (aka .NET 2.0 SP1). If you set the platform target to x64 then the machine type field will be set to IMAGE_FILE_MACHINE_AMD64 (aka x64). That doesn't make much difference, other than that the program will never run on a 32-bit operating system and that the main thread will get started with a 4 megabyte stack instead of a 1 MB stack.</p> <p>The magic that turns a 32-bit executable image into a 64-bit process is described in <a href="https://stackoverflow.com/questions/10389756/how-does-corflags-exe-32bit-work/10392396#10392396">this answer</a>.</p>
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