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    <p>This isn't well documented in any place I know of, I can only point you to a relevant MSDN article. Yes, your assumption is correct, the loader in Windows XP and up has awareness of managed executables. It automatically loads the .NET loader shim (c:\windows\system32\mscoree.dll), the relevant entrypoint is <a href="http://msdn.microsoft.com/en-us/library/4ce9k7xb%28v=vs.90%29.aspx" rel="noreferrer">_CorValidateImage()</a>. The Remarks section in the linked MSDN article describes the mechanism that turns a 32-bit .exe file into a 64-bit process:</p> <blockquote> <p>In Windows XP and later versions, the operating system loader checks for managed modules by examining the COM Descriptor Directory bit in the common object file format (COFF) header. A set bit indicates a managed module. If the loader detects a managed module, it loads MsCorEE.dll and calls _CorValidateImage, which performs the following actions:</p> <ul> <li>Confirms that the image is a valid managed module.</li> <li>Changes the entry point in the image to an entry point in the common language runtime (CLR).</li> <li>For 64-bit versions of Windows, modifies the image that is in memory by transforming it from PE32 to PE32+ format.</li> <li>Returns to the loader when the managed module images are loaded.</li> </ul> <p>For executable images, the operating system loader then calls the _CorExeMain function, regardless of the entry point specified in the executable. For DLL assembly images, the loader calls the _CorDllMain function.</p> <p>_CorExeMain or _CorDllMain performs the following actions:</p> <ul> <li>Initializes the CLR.</li> <li>Locates the managed entry point from the assembly's CLR header.</li> <li>Begins execution.</li> </ul> <p>The loader calls the _CorImageUnloading function when managed module images are unloaded. However, this function does not perform any action; it just returns.</p> </blockquote>
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    1. POHow does CorFlags.exe /32BIT+ work?
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    1. POHow does CorFlags.exe /32BIT+ work?
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    1. COThanks for the quick answer. This is a good starting point. I wanted to find out how clr deals with .reloc sections. I dug in sscli, mostly in pedecoder.h/pewriter.cpp and found my answers. Still there are many questions (e.g. what about Windows 2000 x64) but I guess I will find the answers in sscli.
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    2. COThat's an easy one, Windows 2000 x64 has last been seen used by the great white Yeti.
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    3. COWow. I wonder if there is any way to take advantage of this "special awareness" to create proper fat (native code) binaries for Windows.
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