diff --git a/anbs_cp/Classes/FileExtensions.cs b/anbs_cp/Classes/FileExtensions.cs
new file mode 100644
index 0000000..7dee49b
--- /dev/null
+++ b/anbs_cp/Classes/FileExtensions.cs
@@ -0,0 +1,71 @@
+using System.Security.Cryptography;
+
+using Microsoft.AspNetCore.Http;
+
+using MimeKit;
+
+namespace anbs_cp.Classes;
+
+/// 
+/// Класс -- расширение для класса File
+/// 
+public static class FileExtension
+{
+    /// 
+    /// Получение md5-хэша файла.
+    /// Взято с https://stackoverflow.com/a/24031467/16469671
+    /// 
+    /// Имя файла
+    /// Массив хэша
+    public static byte[] Hash (string fileName)
+    {
+        using MD5 md5 = MD5.Create();
+        byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(fileName);
+        byte[] result = md5.ComputeHash(inputBytes);
+
+        return result;
+    }
+
+    /// 
+    /// Получение md5-хэша загружаемого файла.
+    /// Взято с https://stackoverflow.com/a/67081012/16469671
+    /// 
+    /// Загружаемый файл
+    /// Массив хэша
+    public static byte[] Hash (IFormFile file)
+    {
+        using MD5 md5 = MD5.Create();
+        using StreamReader streamReader = new(file.OpenReadStream());
+        return md5.ComputeHash(streamReader.BaseStream);
+    }
+
+    /// 
+    /// Получение md5-хэша файла и вывод в строке.
+    /// 
+    /// Имя файла
+    /// Срока с хэшем файла
+    public static string HashString (string fileName) => Convert.ToHexString(Hash(fileName));
+
+    /// 
+    /// Получение md5-хэша файла и вывод в строке.
+    /// 
+    /// Загружаемый файл
+    /// Срока с хэшем файла
+    public static string HashString (IFormFile file) => Convert.ToHexString(Hash(file));
+
+    /// 
+    /// Получает MIME-тип файла
+    /// 
+    /// Имя файла
+    /// MIME-тип файла
+    public static string MIMEType (string filename) =>
+        MimeTypes.GetMimeType(filename);
+
+    /// 
+    /// Получает MIME-тип файла
+    /// 
+    /// Загружаемый файл
+    /// MIME-тип файла
+    public static string MIMEType (IFormFile file) =>
+        file.ContentType;
+}
\ No newline at end of file
diff --git a/anbs_cp/anbs_cp.csproj b/anbs_cp/anbs_cp.csproj
index 3400fff..b3ae293 100644
--- a/anbs_cp/anbs_cp.csproj
+++ b/anbs_cp/anbs_cp.csproj
@@ -2,7 +2,7 @@
 
   
     net7.0
-    1.2022.1130
+    2022.1203.1
     Alexander Babaev
     ANB Software Components Pack
     Library of some useful functions in C# language.
@@ -15,8 +15,8 @@
     True
     https://git.babaev-an.ru/babaev-an/anbsoftware_componentspack
     https://git.babaev-an.ru/babaev-an/anbsoftware_componentspack
-    1.2022.1130
-    1.2022.1130
+    2022.1203.1
+    2022.1203.1
     ANBSoftware.ComponentsPack
     MIT
     6.0
@@ -27,16 +27,20 @@
   
     7
     True
+    none
   
 
   
     7
     True
+    none
   
 
   
     
+    
     
+    
   
 
 
diff --git a/anbsoftware.componentspack.sln.DotSettings b/anbsoftware.componentspack.sln.DotSettings
index 5d94243..68f48c1 100644
--- a/anbsoftware.componentspack.sln.DotSettings
+++ b/anbsoftware.componentspack.sln.DotSettings
@@ -2,4 +2,7 @@
 	True
 	True
 	True
-	True
\ No newline at end of file
+	True
+	True
+	True
+	True
\ No newline at end of file
diff --git a/demo/CountValueTest.Designer.cs b/demo/CountValueTest.Designer.cs
index 19fd306..aef3ab5 100644
--- a/demo/CountValueTest.Designer.cs
+++ b/demo/CountValueTest.Designer.cs
@@ -28,97 +28,98 @@ sealed partial class CountValueTest
     /// 
     private void InitializeComponent ()
     {
-        this.InsertDataLabel = new System.Windows.Forms.Label();
-        this.InsertDataBox = new System.Windows.Forms.TextBox();
-        this.ResultLabel = new System.Windows.Forms.Label();
-        this.CalculateButton = new System.Windows.Forms.Button();
-        this.SelectFormatterLabel = new System.Windows.Forms.Label();
-        this.SelectFormatterBox = new System.Windows.Forms.ComboBox();
-        this.SuspendLayout();
-        // 
-        // InsertDataLabel
-        // 
-        this.InsertDataLabel.AutoSize = true;
-        this.InsertDataLabel.Location = new System.Drawing.Point(12, 66);
-        this.InsertDataLabel.Name = "InsertDataLabel";
-        this.InsertDataLabel.Size = new System.Drawing.Size(197, 17);
-        this.InsertDataLabel.TabIndex = 0;
-        this.InsertDataLabel.Text = "&Insert any int value:";
-        // 
-        // InsertDataBox
-        // 
-        this.InsertDataBox.Location = new System.Drawing.Point(12, 86);
-        this.InsertDataBox.Name = "InsertDataBox";
-        this.InsertDataBox.Size = new System.Drawing.Size(246, 24);
-        this.InsertDataBox.TabIndex = 1;
-        // 
-        // ResultLabel
-        // 
-        this.ResultLabel.Dock = System.Windows.Forms.DockStyle.Bottom;
-        this.ResultLabel.Location = new System.Drawing.Point(0, 143);
-        this.ResultLabel.Margin = new System.Windows.Forms.Padding(5);
-        this.ResultLabel.Name = "ResultLabel";
-        this.ResultLabel.Padding = new System.Windows.Forms.Padding(5);
-        this.ResultLabel.Size = new System.Drawing.Size(270, 79);
-        this.ResultLabel.TabIndex = 2;
-        this.ResultLabel.Text = "&Insert any int value to insert box above and press \"Calculate\" button to see res" +
-"ult...";
-        this.ResultLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
-        // 
-        // CalculateButton
-        // 
-        this.CalculateButton.Location = new System.Drawing.Point(81, 116);
-        this.CalculateButton.Name = "CalculateButton";
-        this.CalculateButton.Size = new System.Drawing.Size(103, 23);
-        this.CalculateButton.TabIndex = 3;
-        this.CalculateButton.Text = "Calc&ulate";
-        this.CalculateButton.UseVisualStyleBackColor = true;
-        this.CalculateButton.Click += new System.EventHandler(this.CalculateButton_Click);
-        // 
-        // SelectFormatterLabel
-        // 
-        this.SelectFormatterLabel.AutoSize = true;
-        this.SelectFormatterLabel.Location = new System.Drawing.Point(12, 9);
-        this.SelectFormatterLabel.Name = "SelectFormatterLabel";
-        this.SelectFormatterLabel.Size = new System.Drawing.Size(161, 17);
-        this.SelectFormatterLabel.TabIndex = 4;
-        this.SelectFormatterLabel.Text = "&Select formatter:";
-        // 
-        // SelectFormatterBox
-        // 
-        this.SelectFormatterBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
-        this.SelectFormatterBox.FlatStyle = System.Windows.Forms.FlatStyle.System;
-        this.SelectFormatterBox.FormattingEnabled = true;
-        this.SelectFormatterBox.Items.AddRange(new object[] {
-            "CountFormatter",
-            "FileSizeFormatter"});
-        this.SelectFormatterBox.Location = new System.Drawing.Point(12, 29);
-        this.SelectFormatterBox.Name = "SelectFormatterBox";
-        this.SelectFormatterBox.Size = new System.Drawing.Size(246, 25);
-        this.SelectFormatterBox.TabIndex = 5;
-        // 
-        // CountValueTest
-        // 
-        this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 17F);
-        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-        this.ClientSize = new System.Drawing.Size(270, 222);
-        this.Controls.Add(this.SelectFormatterBox);
-        this.Controls.Add(this.SelectFormatterLabel);
-        this.Controls.Add(this.CalculateButton);
-        this.Controls.Add(this.ResultLabel);
-        this.Controls.Add(this.InsertDataBox);
-        this.Controls.Add(this.InsertDataLabel);
-        this.Font = new System.Drawing.Font("Courier New", 11.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
-        this.Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
-        this.MaximizeBox = false;
-        this.MinimizeBox = false;
-        this.Name = "CountValueTest";
-        this.ShowIcon = false;
-        this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
-        this.Text = "Formatter Test Unit";
-        this.Load += new System.EventHandler(this.CountValueTest_Load);
-        this.ResumeLayout(false);
-        this.PerformLayout();
+            this.InsertDataLabel = new System.Windows.Forms.Label();
+            this.InsertDataBox = new System.Windows.Forms.TextBox();
+            this.ResultLabel = new System.Windows.Forms.Label();
+            this.CalculateButton = new System.Windows.Forms.Button();
+            this.SelectFormatterLabel = new System.Windows.Forms.Label();
+            this.SelectFormatterBox = new System.Windows.Forms.ComboBox();
+            this.SuspendLayout();
+            // 
+            // InsertDataLabel
+            // 
+            this.InsertDataLabel.AutoSize = true;
+            this.InsertDataLabel.Location = new System.Drawing.Point(12, 66);
+            this.InsertDataLabel.Name = "InsertDataLabel";
+            this.InsertDataLabel.Size = new System.Drawing.Size(341, 17);
+            this.InsertDataLabel.TabIndex = 0;
+            this.InsertDataLabel.Text = "&Введите любое целочисленное значение:";
+            // 
+            // InsertDataBox
+            // 
+            this.InsertDataBox.Location = new System.Drawing.Point(12, 86);
+            this.InsertDataBox.Name = "InsertDataBox";
+            this.InsertDataBox.Size = new System.Drawing.Size(341, 24);
+            this.InsertDataBox.TabIndex = 1;
+            this.InsertDataBox.TextChanged += new System.EventHandler(this.InsertDataBox_TextChanged);
+            // 
+            // ResultLabel
+            // 
+            this.ResultLabel.Dock = System.Windows.Forms.DockStyle.Bottom;
+            this.ResultLabel.Location = new System.Drawing.Point(0, 143);
+            this.ResultLabel.Margin = new System.Windows.Forms.Padding(5);
+            this.ResultLabel.Name = "ResultLabel";
+            this.ResultLabel.Padding = new System.Windows.Forms.Padding(5);
+            this.ResultLabel.Size = new System.Drawing.Size(365, 79);
+            this.ResultLabel.TabIndex = 2;
+            this.ResultLabel.Text = "&Вставьте любое целочисленное значение в поле выше и нажмите кнопку \"Вычислить\", " +
+    "чтобы увидеть результат...";
+            this.ResultLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
+            // 
+            // CalculateButton
+            // 
+            this.CalculateButton.Location = new System.Drawing.Point(140, 116);
+            this.CalculateButton.Name = "CalculateButton";
+            this.CalculateButton.Size = new System.Drawing.Size(103, 23);
+            this.CalculateButton.TabIndex = 3;
+            this.CalculateButton.Text = "В&ычислить";
+            this.CalculateButton.UseVisualStyleBackColor = true;
+            this.CalculateButton.Click += new System.EventHandler(this.CalculateButton_Click);
+            // 
+            // SelectFormatterLabel
+            // 
+            this.SelectFormatterLabel.AutoSize = true;
+            this.SelectFormatterLabel.Location = new System.Drawing.Point(12, 9);
+            this.SelectFormatterLabel.Name = "SelectFormatterLabel";
+            this.SelectFormatterLabel.Size = new System.Drawing.Size(188, 17);
+            this.SelectFormatterLabel.TabIndex = 4;
+            this.SelectFormatterLabel.Text = "В&ыберете обработчик:";
+            // 
+            // SelectFormatterBox
+            // 
+            this.SelectFormatterBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
+            this.SelectFormatterBox.FlatStyle = System.Windows.Forms.FlatStyle.System;
+            this.SelectFormatterBox.FormattingEnabled = true;
+            this.SelectFormatterBox.Items.AddRange(new object[] {
+            "Обработчик счёта",
+            "Обработчик размера файла"});
+            this.SelectFormatterBox.Location = new System.Drawing.Point(12, 29);
+            this.SelectFormatterBox.Name = "SelectFormatterBox";
+            this.SelectFormatterBox.Size = new System.Drawing.Size(341, 25);
+            this.SelectFormatterBox.TabIndex = 5;
+            // 
+            // CountValueTest
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 17F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(365, 222);
+            this.Controls.Add(this.SelectFormatterBox);
+            this.Controls.Add(this.SelectFormatterLabel);
+            this.Controls.Add(this.CalculateButton);
+            this.Controls.Add(this.ResultLabel);
+            this.Controls.Add(this.InsertDataBox);
+            this.Controls.Add(this.InsertDataLabel);
+            this.Font = new System.Drawing.Font("Courier New", 11.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            this.Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
+            this.MaximizeBox = false;
+            this.MinimizeBox = false;
+            this.Name = "CountValueTest";
+            this.ShowIcon = false;
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "Тест модуля форматирования строки";
+            this.Load += new System.EventHandler(this.CountValueTest_Load);
+            this.ResumeLayout(false);
+            this.PerformLayout();
 
     }
 
diff --git a/demo/CountValueTest.cs b/demo/CountValueTest.cs
index 413373c..e8c7202 100644
--- a/demo/CountValueTest.cs
+++ b/demo/CountValueTest.cs
@@ -29,4 +29,12 @@ public sealed partial class CountValueTest: Form
     {
         SelectFormatterBox.SelectedIndex = 0;
     }
+
+    private void InsertDataBox_TextChanged (object sender, EventArgs e)
+    {
+        ulong value = TypeConverter.StrToUInt64(InsertDataBox.Text);
+
+        if (value > long.MaxValue)
+            InsertDataBox.Text = long.MaxValue.ToString();
+    }
 }
\ No newline at end of file
diff --git a/demo/FileHashAndMimeTypeTest.Designer.cs b/demo/FileHashAndMimeTypeTest.Designer.cs
new file mode 100644
index 0000000..bb6e4f9
--- /dev/null
+++ b/demo/FileHashAndMimeTypeTest.Designer.cs
@@ -0,0 +1,125 @@
+namespace demo;
+
+sealed partial class FileHashAndMimeType
+{
+    /// 
+    ///  Required designer variable.
+    /// 
+    private System.ComponentModel.IContainer components = null;
+
+    /// 
+    ///  Clean up any resources being used.
+    /// 
+    /// true if managed resources should be disposed; otherwise, false.
+    protected override void Dispose (bool disposing)
+    {
+        if (disposing && (components != null))
+        {
+            components.Dispose();
+        }
+        base.Dispose(disposing);
+    }
+
+    #region Windows Form Designer generated code
+
+    /// 
+    ///  Required method for Designer support - do not modify
+    ///  the contents of this method with the code editor.
+    /// 
+    private void InitializeComponent ()
+    {
+            this.ResultLabel = new System.Windows.Forms.Label();
+            this.SelectFileLabel = new System.Windows.Forms.Label();
+            this.fileNameEdt = new System.Windows.Forms.TextBox();
+            this.ViewButton = new System.Windows.Forms.Button();
+            this.openFileDialog = new System.Windows.Forms.OpenFileDialog();
+            this.topPanel = new System.Windows.Forms.Panel();
+            this.topPanel.SuspendLayout();
+            this.SuspendLayout();
+            // 
+            // ResultLabel
+            // 
+            this.ResultLabel.Dock = System.Windows.Forms.DockStyle.Fill;
+            this.ResultLabel.Location = new System.Drawing.Point(0, 0);
+            this.ResultLabel.Margin = new System.Windows.Forms.Padding(5);
+            this.ResultLabel.Name = "ResultLabel";
+            this.ResultLabel.Padding = new System.Windows.Forms.Padding(5);
+            this.ResultLabel.Size = new System.Drawing.Size(412, 428);
+            this.ResultLabel.TabIndex = 2;
+            this.ResultLabel.Text = "В&ыберете файл (введите ипя файла с полным путём вверху или с помощью диалога, на" +
+    "жав \"Обзор\")...";
+            this.ResultLabel.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
+            // 
+            // SelectFileLabel
+            // 
+            this.SelectFileLabel.AutoSize = true;
+            this.SelectFileLabel.Location = new System.Drawing.Point(3, 11);
+            this.SelectFileLabel.Name = "SelectFileLabel";
+            this.SelectFileLabel.Size = new System.Drawing.Size(134, 17);
+            this.SelectFileLabel.TabIndex = 4;
+            this.SelectFileLabel.Text = "В&ыберете файл:";
+            // 
+            // fileNameEdt
+            // 
+            this.fileNameEdt.Location = new System.Drawing.Point(3, 38);
+            this.fileNameEdt.Name = "fileNameEdt";
+            this.fileNameEdt.Size = new System.Drawing.Size(288, 24);
+            this.fileNameEdt.TabIndex = 5;
+            this.fileNameEdt.TextChanged += new System.EventHandler(this.fileNameEdt_TextChanged);
+            // 
+            // ViewButton
+            // 
+            this.ViewButton.Location = new System.Drawing.Point(297, 39);
+            this.ViewButton.Name = "ViewButton";
+            this.ViewButton.Size = new System.Drawing.Size(103, 23);
+            this.ViewButton.TabIndex = 3;
+            this.ViewButton.Text = "&Обзор";
+            this.ViewButton.UseVisualStyleBackColor = true;
+            this.ViewButton.Click += new System.EventHandler(this.ViewButton_Click);
+            // 
+            // openFileDialog
+            // 
+            this.openFileDialog.AddToRecent = false;
+            this.openFileDialog.Filter = "Все файлы|*.*";
+            this.openFileDialog.FileOk += new System.ComponentModel.CancelEventHandler(this.openFileDialog_FileOk);
+            // 
+            // topPanel
+            // 
+            this.topPanel.Controls.Add(this.SelectFileLabel);
+            this.topPanel.Controls.Add(this.ViewButton);
+            this.topPanel.Controls.Add(this.fileNameEdt);
+            this.topPanel.Dock = System.Windows.Forms.DockStyle.Top;
+            this.topPanel.Location = new System.Drawing.Point(0, 0);
+            this.topPanel.Name = "topPanel";
+            this.topPanel.Size = new System.Drawing.Size(412, 74);
+            this.topPanel.TabIndex = 6;
+            // 
+            // FileHashAndMimeType
+            // 
+            this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 17F);
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
+            this.ClientSize = new System.Drawing.Size(412, 428);
+            this.Controls.Add(this.topPanel);
+            this.Controls.Add(this.ResultLabel);
+            this.Font = new System.Drawing.Font("Courier New", 11.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            this.Margin = new System.Windows.Forms.Padding(4, 3, 4, 3);
+            this.MaximizeBox = false;
+            this.MinimizeBox = false;
+            this.Name = "FileHashAndMimeType";
+            this.ShowIcon = false;
+            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
+            this.Text = "Получение хэша и MIME-типа файла";
+            this.topPanel.ResumeLayout(false);
+            this.topPanel.PerformLayout();
+            this.ResumeLayout(false);
+
+    }
+
+    #endregion
+    private Label ResultLabel;
+    private Label SelectFileLabel;
+    private TextBox fileNameEdt;
+    private Button ViewButton;
+    private OpenFileDialog openFileDialog;
+    private Panel topPanel;
+}
\ No newline at end of file
diff --git a/demo/FileHashAndMimeTypeTest.cs b/demo/FileHashAndMimeTypeTest.cs
new file mode 100644
index 0000000..0cc25ad
--- /dev/null
+++ b/demo/FileHashAndMimeTypeTest.cs
@@ -0,0 +1,42 @@
+using anbs_cp.Classes;
+// ReSharper disable LocalizableElement
+
+namespace demo;
+
+public sealed partial class FileHashAndMimeType: Form
+{
+    public FileHashAndMimeType ()
+    {
+        InitializeComponent();
+    }
+
+    private void ViewButton_Click (object sender, EventArgs e)
+    {
+        openFileDialog.ShowDialog();
+    }
+
+private void GetFileHashAndMimeType()
+    {
+        if (string.IsNullOrEmpty(fileNameEdt.Text))
+        {
+            ResultLabel.Text = "      !";
+            return;
+        }
+
+        string fileHash = FileExtension.HashString(fileNameEdt.Text);
+        string fileType = FileExtension.MIMEType(fileNameEdt.Text);
+
+        ResultLabel.Text =
+            $"    \r\n{fileNameEdt.Text}\r\n :\r\n{fileHash}\r\n :\r\n{fileType}";
+    }
+
+    private void openFileDialog_FileOk (object sender, System.ComponentModel.CancelEventArgs e)
+    {
+        fileNameEdt.Text = openFileDialog.FileName;
+    }
+
+    private void fileNameEdt_TextChanged (object sender, EventArgs e)
+    {
+        GetFileHashAndMimeType();
+    }
+}
\ No newline at end of file
diff --git a/demo/FileHashAndMimeTypeTest.resx b/demo/FileHashAndMimeTypeTest.resx
new file mode 100644
index 0000000..e6275bd
--- /dev/null
+++ b/demo/FileHashAndMimeTypeTest.resx
@@ -0,0 +1,63 @@
+
+  
+    
+    
+      
+        
+          
+            
+              
+                
+              
+              
+              
+              
+              
+            
+          
+          
+            
+              
+              
+            
+          
+          
+            
+              
+                
+                
+              
+              
+              
+              
+              
+            
+          
+          
+            
+              
+                
+              
+              
+            
+          
+        
+      
+    
+  
+  
+    text/microsoft-resx
+  
+  
+    2.0
+  
+  
+    System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
+  
+  
+    System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
+  
+  
+    17, 17
+  
+
\ No newline at end of file
diff --git a/demo/MainMenu.Designer.cs b/demo/MainMenu.Designer.cs
index 9f45d05..133bf74 100644
--- a/demo/MainMenu.Designer.cs
+++ b/demo/MainMenu.Designer.cs
@@ -30,6 +30,7 @@ sealed partial class MainMenu
     {
             this.CountValueTest = new System.Windows.Forms.Button();
             this.SimpleMapperTest = new System.Windows.Forms.Button();
+            this.FileExtensionTest = new System.Windows.Forms.Button();
             this.SuspendLayout();
             // 
             // CountValueTest
@@ -38,7 +39,7 @@ sealed partial class MainMenu
             this.CountValueTest.Name = "CountValueTest";
             this.CountValueTest.Size = new System.Drawing.Size(337, 53);
             this.CountValueTest.TabIndex = 0;
-            this.CountValueTest.Text = "New CountValue Test";
+            this.CountValueTest.Text = "Новый тест модуля форматирования строки";
             this.CountValueTest.UseVisualStyleBackColor = true;
             this.CountValueTest.Click += new System.EventHandler(this.button1_Click);
             // 
@@ -48,22 +49,34 @@ sealed partial class MainMenu
             this.SimpleMapperTest.Name = "SimpleMapperTest";
             this.SimpleMapperTest.Size = new System.Drawing.Size(335, 51);
             this.SimpleMapperTest.TabIndex = 1;
-            this.SimpleMapperTest.Text = "New SimpleMapper test";
+            this.SimpleMapperTest.Text = "Новый тест модуля SimpleMapper";
             this.SimpleMapperTest.UseVisualStyleBackColor = true;
             this.SimpleMapperTest.Click += new System.EventHandler(this.SimpleMapperTest_Click);
             // 
+            // FileExtensionTest
+            // 
+            this.FileExtensionTest.Location = new System.Drawing.Point(12, 128);
+            this.FileExtensionTest.Name = "FileExtensionTest";
+            this.FileExtensionTest.Size = new System.Drawing.Size(335, 51);
+            this.FileExtensionTest.TabIndex = 2;
+            this.FileExtensionTest.Text = "Новый тест модуля FileExtension";
+            this.FileExtensionTest.UseVisualStyleBackColor = true;
+            this.FileExtensionTest.Click += new System.EventHandler(this.FileExtensionTest_Click);
+            // 
             // MainMenu
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(10F, 21F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(361, 252);
+            this.Controls.Add(this.FileExtensionTest);
             this.Controls.Add(this.SimpleMapperTest);
             this.Controls.Add(this.CountValueTest);
             this.Font = new System.Drawing.Font("Times New Roman", 14.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
             this.Margin = new System.Windows.Forms.Padding(4);
             this.Name = "MainMenu";
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
-            this.Text = "Main menu";
+            this.Text = "Главное меню";
             this.ResumeLayout(false);
 
     }
@@ -72,4 +85,5 @@ sealed partial class MainMenu
 
     private Button CountValueTest;
     private Button SimpleMapperTest;
+    private Button FileExtensionTest;
 }
diff --git a/demo/MainMenu.cs b/demo/MainMenu.cs
index cf9b2af..c85a8f8 100644
--- a/demo/MainMenu.cs
+++ b/demo/MainMenu.cs
@@ -17,4 +17,10 @@ public sealed partial class MainMenu: Form
         SampleMapperTest formSampleMapperTest = new();
         formSampleMapperTest.ShowDialog();
     }
+
+    private void FileExtensionTest_Click (object sender, EventArgs e)
+    {
+        FileHashAndMimeType formTest = new();
+        formTest.ShowDialog();
+    }
 }
diff --git a/demo/SampleMapperTest.Designer.cs b/demo/SampleMapperTest.Designer.cs
index 8e5fc9f..6b6ca92 100644
--- a/demo/SampleMapperTest.Designer.cs
+++ b/demo/SampleMapperTest.Designer.cs
@@ -81,7 +81,7 @@ sealed partial class SampleMapperTest
             this.MapBtn.Name = "MapBtn";
             this.MapBtn.Size = new System.Drawing.Size(737, 57);
             this.MapBtn.TabIndex = 5;
-            this.MapBtn.Text = "MAP";
+            this.MapBtn.Text = "СВЯЗАТЬ";
             this.MapBtn.UseVisualStyleBackColor = true;
             this.MapBtn.Click += new System.EventHandler(this.MapBtn_Click);
             // 
@@ -142,9 +142,9 @@ sealed partial class SampleMapperTest
             this.MapModeLabel.AutoSize = true;
             this.MapModeLabel.Location = new System.Drawing.Point(32, 230);
             this.MapModeLabel.Name = "MapModeLabel";
-            this.MapModeLabel.Size = new System.Drawing.Size(91, 21);
+            this.MapModeLabel.Size = new System.Drawing.Size(167, 21);
             this.MapModeLabel.TabIndex = 11;
-            this.MapModeLabel.Text = "Map mode";
+            this.MapModeLabel.Text = "Режим связывания:";
             // 
             // SampleMapperTest
             // 
@@ -166,7 +166,7 @@ sealed partial class SampleMapperTest
             this.Margin = new System.Windows.Forms.Padding(4);
             this.Name = "SampleMapperTest";
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
-            this.Text = "SampleMapper test";
+            this.Text = "Тест класса SampleMapper";
             ((System.ComponentModel.ISupportInitialize)(this.DemoIntEdt)).EndInit();
             this.ResumeLayout(false);
             this.PerformLayout();
diff --git a/demo/SampleMapperTest.cs b/demo/SampleMapperTest.cs
index cab7845..0890aa8 100644
--- a/demo/SampleMapperTest.cs
+++ b/demo/SampleMapperTest.cs
@@ -41,9 +41,8 @@ public sealed partial class SampleMapperTest: Form
 
         string serialize2 = JsonConvert.SerializeObject(demo2);
 
-        ResultArea.Text = $@"Demo2 Class before map:
-            {serialize1}
-            and after:{serialize2}";
+        // ReSharper disable once LocalizableElement
+        ResultArea.Text = $"Класс Demo2 до связывания:\r\n{serialize1}\r\nи после:\r\n{serialize2}";
     }
 }
 
diff --git a/demo/demo.csproj b/demo/demo.csproj
index ac4ebca..d1ba3bc 100644
--- a/demo/demo.csproj
+++ b/demo/demo.csproj
@@ -26,4 +26,10 @@
     
   
 
+  
+    
+      Form
+    
+  
+
 
\ No newline at end of file