diff --git a/src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs b/src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs
index fd6823d6b2a..0bfb719e7be 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs
+++ b/src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs
@@ -169,6 +169,30 @@ public override void WriteWarningLine(string message)
 
     internal class CommandLineParameterParser
     {
+        internal static string[] validParameters = {
+            "psconsoleFile",
+            "version",
+            "nologo",
+            "noexit",
+#if !CORECLR
+            "sta",
+            "mta",
+#endif
+            "noprofile",
+            "noninteractive",
+            "inputformat",
+            "outputformat",
+#if !UNIX
+            "windowstyle",
+#endif
+            "encodedcommand",
+            "configurationname",
+            "file",
+            "executionpolicy",
+            "command",
+            "help"
+        };
+
         internal CommandLineParameterParser(PSHostUserInterface hostUI, string bannerText, string helpText)
         {
             if (hostUI == null) { throw new PSArgumentNullException("hostUI"); }
@@ -593,7 +617,7 @@ private void ParseHelper(string[] args)
                         break;
                     }
                 }
-#if !CORECLR  // windowstyle parameter not supported on NanoServer because ProcessWindowStyle does Not exist on CoreCLR
+#if !UNIX
                 else if (MatchSwitch(switchKey, "windowstyle", "w"))
                 {
                     ++i;
@@ -657,7 +681,7 @@ private void ParseHelper(string[] args)
                         WriteCommandLineError(
                             "The -module option can only be specified with the -iss option.",
                             showHelp: true,
-                            showBanner: true);
+                            showBanner: false);
                         break;
                     }
 
@@ -880,7 +904,7 @@ bool TryGetBoolValue(string arg, out bool boolValue)
                 WriteCommandLineError(
                     CommandLineParameterParserStrings.MissingFileArgument,
                     showHelp: true,
-                    showBanner: true);
+                    showBanner: false);
                 return false;
             }
 
@@ -924,15 +948,36 @@ bool TryGetBoolValue(string arg, out bool boolValue)
                 {
                     WriteCommandLineError(
                         string.Format(CultureInfo.CurrentCulture, CommandLineParameterParserStrings.InvalidFileArgument, args[i], exceptionMessage),
-                        showBanner: true);
+                        showBanner: false);
                     return false;
                 }
 
                 if (!System.IO.File.Exists(_file))
                 {
+                    if (args[i].StartsWith("-") && args[i].Length > 1)
+                    {
+                        string param = args[i].Substring(1, args[i].Length - 1).ToLower();
+                        StringBuilder possibleParameters = new StringBuilder();
+                        foreach (string validParameter in validParameters)
+                        {
+                            if (validParameter.Contains(param))
+                            {
+                                possibleParameters.Append("\n  -");
+                                possibleParameters.Append(validParameter);
+                            }
+                        }
+                        if (possibleParameters.Length > 0)
+                        {
+                            WriteCommandLineError(
+                                string.Format(CultureInfo.CurrentCulture, CommandLineParameterParserStrings.InvalidArgument, args[i]),
+                                showBanner: false);
+                            WriteCommandLineError(possibleParameters.ToString(), showBanner: false);
+                            return false;
+                        }
+                    }
                     WriteCommandLineError(
                         string.Format(CultureInfo.CurrentCulture, CommandLineParameterParserStrings.ArgumentFileDoesNotExist, args[i]),
-                        showBanner: true);
+                        showBanner: false);
                     return false;
                 }
 
diff --git a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs
index 2513fe9e963..0f0c7f5cc4d 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs
+++ b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleControl.cs
@@ -445,8 +445,7 @@ internal enum KeyboardFlag : uint
         internal const int SW_FORCEMINIMIZE = 11;
         internal const int SW_MAX = 11;
 
-
-#if !CORECLR  // ProcessWindowStyle does Not exist on CoreCLR
+#if !UNIX
         /// <summary>
         /// Code to control the display properties of the a window...
         /// </summary>
diff --git a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHost.cs b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHost.cs
index c2eb41a1f85..a2bb66e1ce8 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHost.cs
+++ b/src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHost.cs
@@ -53,10 +53,10 @@ internal sealed partial class ConsoleHost
     {
         #region static methods
 
-        internal const uint ExitCodeSuccess = 0x00000000;
-        internal const uint ExitCodeCtrlBreak = 0xFFFE0000;
-        internal const uint ExitCodeInitFailure = 0xFFFF0000;
-        internal const uint ExitCodeBadCommandLineParameter = 0xFFFD0000;
+        internal const int ExitCodeSuccess = 0;
+        internal const int ExitCodeCtrlBreak = 128+21; // SIGBREAK
+        internal const int ExitCodeInitFailure = 70; // Internal Software Error
+        internal const int ExitCodeBadCommandLineParameter = 64; // Command Line Usage Error
 
         // NTRAID#Windows Out Of Band Releases-915506-2005/09/09
         // Removed HandleUnexpectedExceptions infrastructure
@@ -212,10 +212,7 @@ internal static int Start(
                     {
                         s_theConsoleHost.ui.WriteErrorLine(ConsoleHostStrings.ConflictingServerModeParameters);
                     }
-                    unchecked
-                    {
-                        return (int)ExitCodeBadCommandLineParameter;
-                    }
+                    return ExitCodeBadCommandLineParameter;
                 }
 
                 // First check for and handle PowerShell running in a server mode.
diff --git a/src/Microsoft.PowerShell.ConsoleHost/resources/CommandLineParameterParserStrings.resx b/src/Microsoft.PowerShell.ConsoleHost/resources/CommandLineParameterParserStrings.resx
index 9209d37a603..92ef090cd2a 100644
--- a/src/Microsoft.PowerShell.ConsoleHost/resources/CommandLineParameterParserStrings.resx
+++ b/src/Microsoft.PowerShell.ConsoleHost/resources/CommandLineParameterParserStrings.resx
@@ -252,7 +252,7 @@ EXAMPLES
     <value>Processing -File '{0}' failed because the file does not have a '.ps1' extension. Specify a valid Windows PowerShell script file name, and then try again.</value>
   </data>
   <data name="ArgumentFileDoesNotExist" xml:space="preserve">
-    <value>The argument '{0}' to the -File parameter does not exist. Provide the path to an existing '.ps1' file as an argument to the -File parameter.</value>
+    <value>The argument '{0}' is not recognized as the name of a script file. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.</value>
   </data>
   <data name="BadArgsValue" xml:space="preserve">
     <value>Cannot process the command because the value specified with -EncodedArguments is not properly encoded. The value must be Base64 encoded.</value>
@@ -269,4 +269,7 @@ EXAMPLES
   <data name="MissingConfigurationNameArgument" xml:space="preserve">
     <value>Cannot process the command because -Configuration requires an argument that is a remote endpoint configuration name. Specify this argument and try again.</value>
   </data>
+  <data name="InvalidArgument" xml:space="preserve">
+    <value>Invalid argument '{0}', did you mean:</value>
+  </data>
 </root>
diff --git a/test/powershell/Host/ConsoleHost.Tests.ps1 b/test/powershell/Host/ConsoleHost.Tests.ps1
index 4bb8b8b0581..16c8032381c 100644
--- a/test/powershell/Host/ConsoleHost.Tests.ps1
+++ b/test/powershell/Host/ConsoleHost.Tests.ps1
@@ -52,6 +52,7 @@ Describe "ConsoleHost unit tests" -tags "Feature" {
 
     BeforeAll {
         $powershell = Join-Path -Path $PsHome -ChildPath "powershell"
+        $ExitCodeBadCommandLineParameter = 64
 
         function NewProcessStartInfo([string]$CommandLine, [switch]$RedirectStdIn)
         {
@@ -492,6 +493,95 @@ foo
             powershell -v | Should Match $psversiontable.GitCommitId
         }
     }
+
+    Context "Ambiguous arguments" {
+        It "Ambiguous argument '<testArg>' should return possible matches" -TestCases @(
+            @{testArg="-no";expectedMatches=@("-nologo","-noexit","-noprofile","-noninteractive")},
+            @{testArg="-format";expectedMatches=@("-inputformat","-outputformat")}
+        ) {
+            param($testArg, $expectedMatches)
+            $output = & $powershell $testArg -File foo 2>&1
+            $LASTEXITCODE | Should Be $ExitCodeBadCommandLineParameter
+            $outString = [String]::Join(",", $output)
+            foreach ($expectedMatch in $expectedMatches)
+            {
+                $outString | Should Match $expectedMatch
+            }
+        }
+    }
+}
+
+Describe "WindowStyle argument" -Tag Feature {
+    BeforeAll {
+        $defaultParamValues = $PSDefaultParameterValues.Clone()
+        $PSDefaultParameterValues["it:skip"] = !$IsWindows
+
+        if ($IsWindows)
+        {
+            $ExitCodeBadCommandLineParameter = 64
+            Add-Type -Name User32 -Namespace Test -MemberDefinition @"
+public static WINDOWPLACEMENT GetPlacement(IntPtr hwnd)
+{
+    WINDOWPLACEMENT placement = new WINDOWPLACEMENT();
+    placement.length = Marshal.SizeOf(placement);
+    GetWindowPlacement(hwnd, ref placement);
+    return placement;
+}
+
+[DllImport("user32.dll", SetLastError = true)]
+[return: MarshalAs(UnmanagedType.Bool)]
+public static extern bool GetWindowPlacement(
+    IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
+
+[Serializable]
+[StructLayout(LayoutKind.Sequential)]
+public struct WINDOWPLACEMENT
+{
+    public int length;
+    public int flags;
+    public ShowWindowCommands showCmd;
+    public System.Drawing.Point ptMinPosition;
+    public System.Drawing.Point ptMaxPosition;
+    public System.Drawing.Rectangle rcNormalPosition;
+}
+
+public enum ShowWindowCommands : int
+{
+    Hidden = 0,
+    Normal = 1,
+    Minimized = 2,
+    Maximized = 3,
+}
+"@
+        }
+    }
+
+    AfterAll {
+        $global:PSDefaultParameterValues = $defaultParamValues
+    }
+
+    It "-WindowStyle <WindowStyle> should work on Windows" -TestCases @(
+            @{WindowStyle="Normal"},
+            @{WindowStyle="Minimized"},
+            @{WindowStyle="Maximized"}  # hidden doesn't work in CI/Server Core
+        ) {
+        param ($WindowStyle)
+        $ps = Start-Process powershell -ArgumentList "-WindowStyle $WindowStyle -noexit -interactive" -PassThru
+        $startTime = Get-Date
+        $showCmd = "Unknown"
+        while (((Get-Date) - $startTime).TotalSeconds -lt 10 -and $showCmd -ne $WindowStyle)
+        {
+            Start-Sleep -Milliseconds 100
+            $showCmd = ([Test.User32]::GetPlacement($ps.MainWindowHandle)).showCmd
+        }
+        $showCmd | Should BeExactly $WindowStyle
+        $ps | Stop-Process -Force
+    }
+
+    It "Invalid -WindowStyle returns error" {
+        powershell -WindowStyle invalid
+        $LASTEXITCODE | Should Be $ExitCodeBadCommandLineParameter
+    }
 }
 
 Describe "Console host api tests" -Tag CI {