How Can I Accurately Determine if My .NET Application is Running on a 64-bit Windows System?

Reliable 64-bit Platform Detection in .NET Applications

.NET's Environment.OSVersion.Platform property can be misleading when identifying 64-bit Windows systems, often returning "Win32NT" regardless of the actual architecture. This limitation is particularly relevant in older .NET versions like 2.0.

The Solution for .NET 4 and Later

.NET Framework 4 and later versions offer a precise solution using two dedicated properties:

• Environment.Is64BitProcess: Determines if the current application process is a 64-bit process.
• Environment.Is64BitOperatingSystem: Indicates whether the underlying operating system is 64-bit.

These properties provide unambiguous information about the system's architecture.

Workaround for .NET 2.0

For applications built with .NET 2.0, a reliable direct check isn't available. However, a reasonable approximation can be made by checking the operating system version. Windows Vista and later versions are 64-bit capable:

if (Environment.OSVersion.Version.Major >= 6)
{
    // Likely running on a 64-bit Windows system (Vista or later)
}

Remember, this is an approximation and doesn't guarantee a 64-bit system; it only suggests the possibility.

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