How to Determine if a Process is 32 or 64 Bit

Your first instinct might be to check [IntPtr]::Size but that only works for the current PowerShell process.  In this scenario you want to check any arbitrary process running on the machine.  There doesn’t seem to be a .NET API for this but fortunately we can easily PInvoke to a Win32 API to get the functionality we need.  Here’s the script that does this:

Add-Type -MemberDefinition @' [DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool IsWow64Process( [In] System.IntPtr hProcess, [Out, MarshalAs(UnmanagedType.Bool)] out bool wow64Process); '@ -Name NativeMethods -Namespace Kernel32 Get-Process -Id $id | Foreach { $is32Bit=[int]0 if ([Kernel32.NativeMethods]::IsWow64Process($_.Handle, [ref]$is32Bit)) { "$($_.Name) $($_.Id) is $(if ($is32Bit) {'32-bit'} else {'64-bit'})" } else {"IsWow64Process call failed"} }

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