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public static extern bool IsWow64Process(

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public static extern bool IsWow64Process([In] IntPtr processHandle,

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    Public Shared Function IsWow64Process( _

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     if (!NativeMethods.IsWow64Process(processHandle, out retVal))

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    proc = GetProcAddress(GetModuleHandle("Kernel32.dll"), "IsWow64Process")

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    If IsWow64Process(GetCurrentProcess(), retVal) Then

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Documentation

[IsWow64Process] on MSDN