diff --git a/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs b/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
index 52ca35dff..3a641edc4 100644
--- a/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
+++ b/src/System.Management.Automation/FormatAndOutput/common/PSStyle.cs
@@ -35,7 +35,7 @@ namespace System.Management.Automation
         /// <summary>Classic rendering of progress.</summary>
         Classic = 1,
     }
-    
+
     #region PSStyle
     /// <summary>
     /// Contains configuration for how PowerShell renders text.
@@ -365,7 +365,7 @@ namespace System.Management.Automation
                 get => _error;
                 set => _error = ValidateNoContent(value);
             }
-            
+
             private string _error = "\x1b[31;1m";
 
             /// <summary>
@@ -397,7 +397,7 @@ namespace System.Management.Automation
             {
                 get => _debug;
                 set => _debug = ValidateNoContent(value);
-            }   
+            }
 
             private string _debug = "\x1b[33;1m";
         }
@@ -467,6 +467,16 @@ namespace System.Management.Automation
                     _extensionDictionary.Add(ValidateExtension(extension), ValidateNoContent(decoration));
                 }
 
+                /// <summary>
+                /// Add new extension and decoration to dictionary without validation.
+                /// </summary>
+                /// <param name="extension">Extension to add.</param>
+                /// <param name="decoration">ANSI string value to add.</param>
+                internal void AddWithoutValidation(string extension, string decoration)
+                {
+                    _extensionDictionary.Add(extension, decoration);
+                }
+
                 /// <summary>
                 /// Remove an extension from dictionary.
                 /// </summary>
@@ -543,19 +553,19 @@ namespace System.Management.Automation
                 Extension = new FileExtensionDictionary();
 
                 // archives
-                Extension.Add(".zip", "\x1b[31;1m");
-                Extension.Add(".tgz", "\x1b[31;1m");
-                Extension.Add(".gz", "\x1b[31;1m");
-                Extension.Add(".tar", "\x1b[31;1m");
-                Extension.Add(".nupkg", "\x1b[31;1m");
-                Extension.Add(".cab", "\x1b[31;1m");
-                Extension.Add(".7z", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".zip", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".tgz", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".gz", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".tar", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".nupkg", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".cab", "\x1b[31;1m");
+                Extension.AddWithoutValidation(".7z", "\x1b[31;1m");
 
                 // powershell
-                Extension.Add(".ps1", "\x1b[33;1m");
-                Extension.Add(".psd1", "\x1b[33;1m");
-                Extension.Add(".psm1", "\x1b[33;1m");
-                Extension.Add(".ps1xml", "\x1b[33;1m");
+                Extension.AddWithoutValidation(".ps1", "\x1b[33;1m");
+                Extension.AddWithoutValidation(".psd1", "\x1b[33;1m");
+                Extension.AddWithoutValidation(".psm1", "\x1b[33;1m");
+                Extension.AddWithoutValidation(".ps1xml", "\x1b[33;1m");
             }
         }
 
@@ -688,7 +698,7 @@ namespace System.Management.Automation
 
         private static string ValidateNoContent(string text)
         {
-            var decorartedString = new StringDecorated(text);
+            var decorartedString = new ValueStringDecorated(text);
             if (decorartedString.ContentLength > 0)
             {
                 throw new ArgumentException(string.Format(PSStyleStrings.TextContainsContent, decorartedString.ToString(OutputRendering.PlainText)));