Create a Byte Array for setting Windows proxy machine level settings in the registry

ConvertTo-ProxySettingsBinary.ps1

<#
    .SYNOPSIS
        Convert the proxy settings parameters to a Byte Array that
        can be used to populate the DefaultConnectionSettings and
        SavedLegacySettings registry settings in the registry key
        HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections

    .PARAMETER EnableAutoDetection
        Enable automatic detection of the proxy settings. Defaults
        to 'False'.

    .PARAMETER EnableAutoConfiguration
        Use automatic configuration script for specifying proxy
        settings. Defaults to 'False'.

    .PARAMETER EnableManualProxy
        Use manual proxy server settings. Defaults to 'False'.

    .PARAMETER AutoConfigURL
        The URL of the automatic configuration script to specify
        the proxy settings. Should be specified if 'EnableAutoConfiguration'
        is 'True'.

    .PARAMETER ProxyServer
        The address and port of the manual proxy server to use.
        Should be specified if 'EnableManualProxy' is 'True'.

    .PARAMETER ProxyServerExceptions
        Bypass proxy server for addresses starting with addresses
        in this list.

    .PARAMETER ProxyServerBypassLocal
        Bypass proxy server for local addresses. Defaults to 'False'.
#>
function ConvertTo-ProxySettingsBinary
{
    [CmdletBinding()]
    [OutputType([System.Byte[]])]
    param
    (
        [Parameter()]
        [System.Boolean]
        $EnableAutoDetection = $false,

        [Parameter()]
        [System.Boolean]
        $EnableAutoConfiguration = $false,

        [Parameter()]
        [System.Boolean]
        $EnableManualProxy = $false,

        [Parameter()]
        [System.String]
        $AutoConfigURL,

        [Parameter()]
        [System.String]
        $ProxyServer,

        [Parameter()]
        [System.String[]]
        $ProxyServerExceptions = @(),

        [Parameter()]
        [System.Boolean]
        $ProxyServerBypassLocal = $false
    )

    [System.Byte[]] $proxySettings = @(0x46, 0x0, 0x0, 0x0, 0x8, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0)

    if ($EnableManualProxy)
    {
        $proxySettings[8] = $proxySettings[8] + 2
    }

    if ($EnableAutoConfiguration)
    {
        $proxySettings[8] = $proxySettings[8] + 4
    }

    if ($EnableAutoDetection)
    {
        $proxySettings[8] = $proxySettings[8] + 8
    }

    if ($PSBoundParameters.ContainsKey('ProxyServer'))
    {
        $proxySettings += @($ProxyServer.Length, 0x0, 0x0, 0x0)
        $proxySettings += [Byte[]][Char[]] $ProxyServer
    }
    else
    {
        $proxySettings += @(0x0, 0x0, 0x0, 0x0)
    }

    if ($ProxyServerBypassLocal -eq $true)
    {
        $ProxyServerExceptions += @('<local>')
    }

    if ($ProxyServerExceptions.Count -gt 0)
    {
        $ProxyServerExceptionsString = $ProxyServerExceptions -join ';'
        $proxySettings += @($ProxyServerExceptionsString.Length, 0x0, 0x0, 0x0)
        $proxySettings += [Byte[]][Char[]] $ProxyServerExceptionsString
    }
    else
    {
        $proxySettings += @(0x0, 0x0, 0x0, 0x0)
    }

    if ($PSBoundParameters.ContainsKey('AutoConfigURL'))
    {
        $proxySettings += @($AutoConfigURL.Length, 0x0, 0x0, 0x0)
        $proxySettings += [Byte[]][Char[]] $AutoConfigURL
    }

    $proxySettings += @(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
    $proxySettings += @(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)

    return [System.Byte[]] $proxySettings
}