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    <p>You can use Reflector to look how it is implemented in FW 4.0:</p> <pre><code>[DllImport("kernel32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)] private static extern IntPtr GetProcAddress(IntPtr hModule, string methodName); [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail), DllImport("kernel32.dll", CharSet=CharSet.Auto, SetLastError=true)] private static extern IntPtr GetModuleHandle(string moduleName); [DllImport("kernel32.dll", CharSet=CharSet.Auto, SetLastError=true)] internal static extern IntPtr GetCurrentProcess(); [SecurityCritical] internal static bool DoesWin32MethodExist(string moduleName, string methodName) { IntPtr moduleHandle = GetModuleHandle(moduleName); if (moduleHandle == IntPtr.Zero) { return false; } return (GetProcAddress(moduleHandle, methodName) != IntPtr.Zero); } [return: MarshalAs(UnmanagedType.Bool)] [DllImport("kernel32.dll", SetLastError=true)] internal static extern bool IsWow64Process([In] IntPtr hSourceProcessHandle, [MarshalAs(UnmanagedType.Bool)] out bool isWow64); [SecuritySafeCritical] public static bool get_Is64BitOperatingSystem() { bool flag; return (IntPtr.Size == 8) || ((DoesWin32MethodExist("kernel32.dll", "IsWow64Process") &amp;&amp; IsWow64Process(GetCurrentProcess(), out flag)) &amp;&amp; flag); } </code></pre> <p>It checks if <code>IsWow64Process()</code> function exists, and calls it.</p> <p><strong>Update:</strong> added all functions used by <code>get_Is64BitOperatingSystem()</code></p> <p><strong>Update2:</strong> fixed for 64-bit process</p>
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    1. PO.NET 2.0 Framework in C# check if 64bit os if so do this? if not do this? better answer?
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    1. CO`Win32Native` is an internal class however, and `DoesWin32MethodExist` appears to be new in .NET 4.0.
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    2. COAll this API tells you is whether your 32-bit application is running in WOW64. If you compile for application to be AnyCPU, on a 64-bit OS, it should be running as a 64-bit application and IsWow64() will return false.
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    3. COThanks for that. Reflector loaded 32-bit mscorlib.dll by default, so there is no check if is a 64-bit process. 64-bit version of mscorlib simply returns `true` in `get_Is64BitOperatingSystem()`. Corrected code for this case.
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