diff --git a/src/MpvNet.Windows/Conf.cs b/src/MpvNet.Windows/Conf.cs
index 18314fb..f5da71c 100644
--- a/src/MpvNet.Windows/Conf.cs
+++ b/src/MpvNet.Windows/Conf.cs
@@ -1,5 +1,5 @@
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 
 namespace MpvNet.Windows;
 
diff --git a/src/MpvNet.Windows/GuiCommand.cs b/src/MpvNet.Windows/GuiCommand.cs
index fc69304..6f80ac8 100644
--- a/src/MpvNet.Windows/GuiCommand.cs
+++ b/src/MpvNet.Windows/GuiCommand.cs
@@ -7,7 +7,7 @@ using System.Windows.Forms;
 using System.Windows.Interop;
 using System.Windows;
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 using MpvNet.Windows.WinForms;
 using MpvNet.Windows.WPF.Views;
 using MpvNet.Windows.WPF;
@@ -332,7 +332,7 @@ public class GuiCommand
             int width = Player.GetPropertyInt("video-params/w");
             int height = Player.GetPropertyInt("video-params/h");
             TimeSpan len = TimeSpan.FromSeconds(Player.GetPropertyDouble("duration"));
-            text = path.FileName() + "\n";
+            text = path.FileName + "\n";
             text += FormatTime(len.TotalMinutes) + ":" + FormatTime(len.Seconds) + "\n";
             if (fileSize > 0)
                 text += Convert.ToInt32(fileSize / 1024.0 / 1024.0) + " MB\n";
diff --git a/src/MpvNet.Windows/UI/GlobalHotkey.cs b/src/MpvNet.Windows/UI/GlobalHotkey.cs
index 09e2efe..7934875 100644
--- a/src/MpvNet.Windows/UI/GlobalHotkey.cs
+++ b/src/MpvNet.Windows/UI/GlobalHotkey.cs
@@ -2,7 +2,7 @@
 using System.ComponentModel;
 using System.Runtime.InteropServices;
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 
 namespace MpvNet.Windows.UI;
 
diff --git a/src/MpvNet.Windows/WinForms/MainForm.cs b/src/MpvNet.Windows/WinForms/MainForm.cs
index dd19d55..7a12acb 100644
--- a/src/MpvNet.Windows/WinForms/MainForm.cs
+++ b/src/MpvNet.Windows/WinForms/MainForm.cs
@@ -10,7 +10,7 @@ using System.Text.RegularExpressions;
 using MpvNet.Windows.WPF;
 using MpvNet.Windows.UI;
 using MpvNet.Help;
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 using MpvNet.MVVM;
 using MpvNet.Windows.WPF.MsgBox;
 
diff --git a/src/MpvNet/App.cs b/src/MpvNet/App.cs
index eb62761..4c98c37 100644
--- a/src/MpvNet/App.cs
+++ b/src/MpvNet/App.cs
@@ -1,7 +1,7 @@
 
 using CommunityToolkit.Mvvm.Messaging;
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 using MpvNet.Help;
 using MpvNet.MVVM;
 
diff --git a/src/MpvNet/Chapter.cs b/src/MpvNet/Chapter.cs
index adb62e5..4debd16 100644
--- a/src/MpvNet/Chapter.cs
+++ b/src/MpvNet/Chapter.cs
@@ -1,5 +1,5 @@
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 
 namespace MpvNet;
 
diff --git a/src/MpvNet/ExtensionLoader.cs b/src/MpvNet/ExtensionLoader.cs
index a162275..fd4a5fc 100644
--- a/src/MpvNet/ExtensionLoader.cs
+++ b/src/MpvNet/ExtensionLoader.cs
@@ -1,7 +1,7 @@
 
 using System.Reflection;
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 
 namespace MpvNet;
 
@@ -34,7 +34,7 @@ public class ExtensionLoader
         {
             foreach (string dir in Directory.GetDirectories(path))
             {
-                LoadDll(dir.AddSep() + Path.GetFileName(dir) + ".dll");
+                LoadDll(dir.Separator + Path.GetFileName(dir) + ".dll");
             }
         }
     }
diff --git a/src/MpvNet/ExtensionMethod/ObjectExtension.cs b/src/MpvNet/ExtensionMethod/ObjectExtension.cs
deleted file mode 100644
index e88bd7e..0000000
--- a/src/MpvNet/ExtensionMethod/ObjectExtension.cs
+++ /dev/null
@@ -1,7 +0,0 @@
-
-namespace MpvNet.ExtensionMethod;
-
-public static class ObjectExtension
-{
-    public static string ToStringEx(this object instance) => instance?.ToString() ?? "";
-}
diff --git a/src/MpvNet/ExtensionMethod/ObjectExtensions.cs b/src/MpvNet/ExtensionMethod/ObjectExtensions.cs
new file mode 100644
index 0000000..2b699d4
--- /dev/null
+++ b/src/MpvNet/ExtensionMethod/ObjectExtensions.cs
@@ -0,0 +1,10 @@
+
+namespace MpvNet.Extensions;
+
+public static class ObjectExtensions
+{
+    extension(object instance)
+    {
+        public string ToStringEx() => instance?.ToString() ?? "";
+    }
+}
diff --git a/src/MpvNet/ExtensionMethod/PathStringExtensions.cs b/src/MpvNet/ExtensionMethod/PathStringExtensions.cs
index c314b07..966ea13 100644
--- a/src/MpvNet/ExtensionMethod/PathStringExtensions.cs
+++ b/src/MpvNet/ExtensionMethod/PathStringExtensions.cs
@@ -1,5 +1,5 @@
 
-namespace MpvNet.ExtensionMethod;
+namespace MpvNet.Extensions;
 
 public static class PathStringExtensions
 {
@@ -18,56 +18,60 @@ public static class PathStringExtensions
             {
                 if (chars[x] == '/')
                     return "";
-
                 if (chars[x] == '\\')
                     return "";
-
                 if (chars[x] == '.')
                     return path[(x + (includeDot ? 0 : 1))..].ToLowerInvariant();
             }
 
             return "";
         }
-    }
 
-    public static string FileName(this string instance)
-    {
-        if (string.IsNullOrEmpty(instance))
-            return "";
+        public string FileName
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(filepath))
+                    return "";
 
-        int index = instance.LastIndexOf('\\');
+                int index = filepath.LastIndexOf('\\');
 
-        if (index > -1)
-            return instance[(index + 1)..];
+                if (index > -1)
+                    return filepath[(index + 1)..];
 
-        index = instance.LastIndexOf('/');
+                index = filepath.LastIndexOf('/');
 
-        if (index > -1)
-            return instance[(index + 1)..];
+                if (index > -1)
+                    return filepath[(index + 1)..];
 
-        return instance;
-    }
+                return filepath;
+            }
+        }
 
-    public static string ShortPath(this string instance, int maxLength)
-    {
-        if (string.IsNullOrEmpty(instance))
-            return "";
+        public string ShortPath(int maxLength)
+        {
+            if (string.IsNullOrEmpty(filepath))
+                return "";
 
-        if (instance.Length > maxLength && instance.Substring(1, 2) == ":\\")
-            instance = instance[..3] + "...\\" + instance.FileName();
+            if (filepath.Length > maxLength && filepath.Substring(1, 2) == ":\\")
+                filepath = $"{filepath[..3]}...\\{filepath.FileName}";
 
-        return instance;
-    }
+            return filepath;
+        }
 
-    // Ensure trailing directory separator char
-    public static string AddSep(this string instance)
-    {
-        if (string.IsNullOrEmpty(instance))
-            return "";
+        // Ensure trailing directory separator char
+        public string Separator
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(filepath))
+                    return "";
 
-        if (!instance.EndsWith(Path.DirectorySeparatorChar.ToString()))
-            instance = instance + Path.DirectorySeparatorChar;
+                if (!filepath.EndsWith(Path.DirectorySeparatorChar.ToString()))
+                    filepath = filepath + Path.DirectorySeparatorChar;
 
-        return instance;
+                return filepath;
+            }
+        }
     }
 }
diff --git a/src/MpvNet/ExtensionMethod/StringExtension.cs b/src/MpvNet/ExtensionMethod/StringExtensions.cs
similarity index 64%
rename from src/MpvNet/ExtensionMethod/StringExtension.cs
rename to src/MpvNet/ExtensionMethod/StringExtensions.cs
index 0a11555..a52917e 100644
--- a/src/MpvNet/ExtensionMethod/StringExtension.cs
+++ b/src/MpvNet/ExtensionMethod/StringExtensions.cs
@@ -1,15 +1,15 @@
 
 using System.Globalization;
 
-namespace MpvNet.ExtensionMethod;
+namespace MpvNet.Extensions;
 
-public static class StringExtension
+public static class StringExtensions
 {
-    public static string ToUpperEx(this string instance) => (instance != null) ? instance.ToUpperInvariant() : "";
+    public static string ToUpperEx(this string instance) => instance?.ToUpperInvariant() ?? "";
 
-    public static string ToLowerEx(this string instance) => (instance != null) ? instance.ToLowerInvariant() : "";
+    public static string ToLowerEx(this string instance) => instance?.ToLowerInvariant() ?? "";
 
-    public static string TrimEx(this string? instance) => (instance == null) ? "" : instance.Trim();
+    public static string TrimEx(this string? instance) => instance?.Trim() ?? "";
 
     public static int ToInt(this string instance, int defaultValue = 0)
     {
diff --git a/src/MpvNet/FileTypes.cs b/src/MpvNet/FileTypes.cs
index cba55ff..8d7b338 100644
--- a/src/MpvNet/FileTypes.cs
+++ b/src/MpvNet/FileTypes.cs
@@ -1,5 +1,5 @@
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 
 namespace MpvNet;
 
diff --git a/src/MpvNet/Folder.cs b/src/MpvNet/Folder.cs
index 23c8d3d..9970640 100644
--- a/src/MpvNet/Folder.cs
+++ b/src/MpvNet/Folder.cs
@@ -1,10 +1,10 @@
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 
 namespace MpvNet;
 
 public class Folder
 {
-    public static string Startup { get; } = Path.GetDirectoryName(Environment.ProcessPath)!.AddSep();
-    public static string AppData { get; } = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData).AddSep();
+    public static string Startup { get; } = Path.GetDirectoryName(Environment.ProcessPath)!.Separator;
+    public static string AppData { get; } = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData).Separator;
 }
diff --git a/src/MpvNet/Player.cs b/src/MpvNet/Player.cs
index 1195c22..2531054 100644
--- a/src/MpvNet/Player.cs
+++ b/src/MpvNet/Player.cs
@@ -8,7 +8,7 @@ using System.Text.Json;
 using System.Text.RegularExpressions;
 using System.Threading;
 
-using MpvNet.ExtensionMethod;
+using MpvNet.Extensions;
 using MpvNet.Help;
 using MpvNet.Native;
 
@@ -127,7 +127,7 @@ public class MainPlayer : MpvClient
         {
             string configDir = CommandLine.GetValue("config-dir");
             string fullPath = System.IO.Path.GetFullPath(configDir);
-            App.InputConf.Path = fullPath.AddSep() + "input.conf";
+            App.InputConf.Path = fullPath.Separator + "input.conf";
             string content = App.InputConf.GetContent();
 
             if (!string.IsNullOrEmpty(content))
@@ -250,7 +250,7 @@ public class MainPlayer : MpvClient
                 string? mpvnet_home = Environment.GetEnvironmentVariable("MPVNET_HOME");
 
                 if (Directory.Exists(mpvnet_home))
-                    return _configFolder = mpvnet_home.AddSep();
+                    return _configFolder = mpvnet_home.Separator;
 
                 _configFolder = Folder.Startup + "portable_config";
 
@@ -260,7 +260,7 @@ public class MainPlayer : MpvClient
                 if (!Directory.Exists(_configFolder))
                     Directory.CreateDirectory(_configFolder);
 
-                _configFolder = _configFolder.AddSep();
+                _configFolder = _configFolder.Separator;
             }
 
             return _configFolder;