PowerShell script to register a URL handler for the bf1942:// protocol and act as the handler. Joining a Battlefield 1942 server is only one click away.

bf1942-url-launcher.ps1

<#
PowerShell script to register a URL handler for the bf1942:// protocol and act as the handler. Joining a Battlefield 1942 server is only one click away.

Registers the URL handler if launched without any arguments.
Launches the game and joins the server if launched with valur -URI flag.

URL protocol format: bf1942://[server_ip]:[server_port]
#>

param(
    [uri]$URI
)

function PressKeyToContinue(){
    param(
        [string]$Message
    )

    Write-Host $Message;
    $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');
}

function Ensure-Admin() {
    # Get the ID and security principal of the current user account
    $myWindowsID=[System.Security.Principal.WindowsIdentity]::GetCurrent()
    $myWindowsPrincipal=new-object System.Security.Principal.WindowsPrincipal($myWindowsID)

    # Get the security principal for the Administrator role
    $adminRole=[System.Security.Principal.WindowsBuiltInRole]::Administrator

    # Check to see if we are currently running "as Administrator"
    if (! $myWindowsPrincipal.IsInRole($adminRole)) {
        Write-Host 'Please run the tool as admin in order to register the Battlefield 1942 URL protocol handler'
        PressKeyToContinue -Message 'Press any key to exit...'
        Exit
    }
}

function AddUpdate-RegistryItemProperty() {
    param(
        [string]$Path,
        [string]$Name,
        [string]$Value
    )

    if (-not $(Test-Path -Path $Path)) {
        New-Item -Path $Path -Force -ErrorAction SilentlyContinue -ErrorVariable registryError | Out-Null
    }
    
    if ($Name) {
        New-ItemProperty -Path $Path -Name $Name -Value $Value -Force -ErrorAction SilentlyContinue -ErrorVariable +registryError | Out-Null
    }

    if ($registryError) {
        Write-Error "Failed to add registry item property: $($Path) # $($Name) = $($Value) ($($registryError))"
        PressKeyToContinue -Message 'Press any key to exit...'
        Exit
    }
}

    

function Register-Handler() {
    param(
        [string]$Command
    )

    AddUpdate-RegistryItemProperty -Path 'Registry::HKEY_CLASSES_ROOT\bf1942' -Name '(default)' -Value 'URL:Battlefield 1942 protocol'
    AddUpdate-RegistryItemProperty -Path 'Registry::HKEY_CLASSES_ROOT\bf1942' -Name 'URL Protocol' -Value ''
    AddUpdate-RegistryItemProperty -Path 'Registry::HKEY_CLASSES_ROOT\bf1942\shell'
    AddUpdate-RegistryItemProperty -Path 'Registry::HKEY_CLASSES_ROOT\bf1942\shell\open'
    AddUpdate-RegistryItemProperty -Path 'Registry::HKEY_CLASSES_ROOT\bf1942\shell\open\command' -Name '(default)' -Value $Command
}

function Launch-Game() {
    param(
        [string]$ServerIP,
        [string]$ServerPort
    )

    $regItem = Get-ItemProperty -Path "Registry::HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\EA Games\Battlefield 1942" -ErrorAction SilentlyContinue -ErrorVariable registryError
    if ($registryError) {
        Write-Error 'Failed to find Battlefield 1942 registry entry. Ensure the game has been installed correctly or contact mister249#8356 for help'
        PressKeyToContinue -Message 'Press any key to exit...'
        Exit
    }

    if (! $regItem.GAMEDIR) {
        Write-Error 'Battlefield 1942 registry entry does not reference the game directory. Ensure the game has been installed correctly or contact mister249#8356 for help'
        PressKeyToContinue -Message 'Press any key to exit...'
        Exit
    }

    Start-Process -FilePath "BF1942.exe" -ArgumentList "+restart 1", "+joinServer $($ServerIP):$($ServerPort)" -WorkingDirectory $regItem.GAMEDIR
}

if ($URI) {
    if (! $URI.Host -or ! $URI.Port -or $URI.Port -eq -1) {
        Write-Error 'Invalid URL (host or port missing/invalid)'
        PressKeyToContinue -Message 'Press any key to exit...'
        Exit
    }

    Launch-Game -ServerIP $uri.Host -ServerPort $uri.Port
}
else {
    # Determine what command to register as handler
    if ($MyInvocation.MyCommand.Path) {
        # Register tool as Powershell script if run as script when registering
        $command = "`"$($(Get-Command powershell.exe).Path)`" `"$($ScriptPath)`" -URI `"%1`""
    }
    else {
        # Register tool as exectutable if run as such when registering
        $command = "`"$([System.Diagnostics.Process]::GetCurrentProcess().MainModule.FileName)`"  -URI `"%1`""
    }

    Ensure-Admin
    Register-Handler -Command $command
    
    Write-Host 'Successfully registered URL protocol handler for Battlefield 1942'
    Write-Host 'Note: If you ever move or rename this tool, you will need to run it again to re-register'
    PressKeyToContinue -Message 'Press any key to exit...'
    Exit
}