diff --git a/GUIs.Test.TestGUI/TestGUI.vbproj b/GUIs.Test.TestGUI/TestGUI.vbproj
index a9ba4c44..b4ccc364 100644
--- a/GUIs.Test.TestGUI/TestGUI.vbproj
+++ b/GUIs.Test.TestGUI/TestGUI.vbproj
@@ -113,6 +113,12 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="ApplicationEvents.vb" />
+    <Compile Include="frmChecksum.Designer.vb">
+      <DependentUpon>frmChecksum.vb</DependentUpon>
+    </Compile>
+    <Compile Include="frmChecksum.vb">
+      <SubType>Form</SubType>
+    </Compile>
     <Compile Include="frmConfigTest.Designer.vb">
       <DependentUpon>frmConfigTest.vb</DependentUpon>
     </Compile>
@@ -173,6 +179,9 @@
     </Compile>
   </ItemGroup>
   <ItemGroup>
+    <EmbeddedResource Include="frmChecksum.resx">
+      <DependentUpon>frmChecksum.vb</DependentUpon>
+    </EmbeddedResource>
     <EmbeddedResource Include="frmConfigTest.resx">
       <DependentUpon>frmConfigTest.vb</DependentUpon>
     </EmbeddedResource>
diff --git a/GUIs.Test.TestGUI/frmChecksum.Designer.vb b/GUIs.Test.TestGUI/frmChecksum.Designer.vb
new file mode 100644
index 00000000..4b1aa902
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmChecksum.Designer.vb
@@ -0,0 +1,79 @@
+<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
+Partial Class frmChecksum
+    Inherits System.Windows.Forms.Form
+
+    'Das Formular überschreibt den Löschvorgang, um die Komponentenliste zu bereinigen.
+    <System.Diagnostics.DebuggerNonUserCode()> _
+    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
+        Try
+            If disposing AndAlso components IsNot Nothing Then
+                components.Dispose()
+            End If
+        Finally
+            MyBase.Dispose(disposing)
+        End Try
+    End Sub
+
+    'Wird vom Windows Form-Designer benötigt.
+    Private components As System.ComponentModel.IContainer
+
+    'Hinweis: Die folgende Prozedur ist für den Windows Form-Designer erforderlich.
+    'Das Bearbeiten ist mit dem Windows Form-Designer möglich.  
+    'Das Bearbeiten mit dem Code-Editor ist nicht möglich.
+    <System.Diagnostics.DebuggerStepThrough()> _
+    Private Sub InitializeComponent()
+        Me.OpenFileDialog1 = New System.Windows.Forms.OpenFileDialog()
+        Me.TextBox1 = New System.Windows.Forms.TextBox()
+        Me.Button1 = New System.Windows.Forms.Button()
+        Me.Button3 = New System.Windows.Forms.Button()
+        Me.SuspendLayout()
+        '
+        'OpenFileDialog1
+        '
+        Me.OpenFileDialog1.FileName = "OpenFileDialog1"
+        '
+        'TextBox1
+        '
+        Me.TextBox1.Location = New System.Drawing.Point(12, 12)
+        Me.TextBox1.Name = "TextBox1"
+        Me.TextBox1.Size = New System.Drawing.Size(553, 20)
+        Me.TextBox1.TabIndex = 0
+        '
+        'Button1
+        '
+        Me.Button1.Location = New System.Drawing.Point(571, 10)
+        Me.Button1.Name = "Button1"
+        Me.Button1.Size = New System.Drawing.Size(75, 23)
+        Me.Button1.TabIndex = 2
+        Me.Button1.Text = "Datei 1"
+        Me.Button1.UseVisualStyleBackColor = True
+        '
+        'Button3
+        '
+        Me.Button3.Location = New System.Drawing.Point(652, 10)
+        Me.Button3.Name = "Button3"
+        Me.Button3.Size = New System.Drawing.Size(145, 23)
+        Me.Button3.TabIndex = 2
+        Me.Button3.Text = "Prüfsumme berechnen"
+        Me.Button3.UseVisualStyleBackColor = True
+        '
+        'frmChecksum
+        '
+        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
+        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
+        Me.ClientSize = New System.Drawing.Size(800, 450)
+        Me.Controls.Add(Me.Button3)
+        Me.Controls.Add(Me.Button1)
+        Me.Controls.Add(Me.TextBox1)
+        Me.Name = "frmChecksum"
+        Me.Text = "frmChecksum"
+        Me.ResumeLayout(False)
+        Me.PerformLayout()
+
+    End Sub
+
+    Friend WithEvents OpenFileDialog1 As OpenFileDialog
+    Friend WithEvents TextBox1 As TextBox
+    Friend WithEvents Button1 As Button
+    Friend WithEvents Button3 As Button
+End Class
diff --git a/GUIs.Test.TestGUI/frmChecksum.resx b/GUIs.Test.TestGUI/frmChecksum.resx
new file mode 100644
index 00000000..33c7f672
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmChecksum.resx
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <metadata name="OpenFileDialog1.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>17, 17</value>
+  </metadata>
+</root>
\ No newline at end of file
diff --git a/GUIs.Test.TestGUI/frmChecksum.vb b/GUIs.Test.TestGUI/frmChecksum.vb
new file mode 100644
index 00000000..48c77d71
--- /dev/null
+++ b/GUIs.Test.TestGUI/frmChecksum.vb
@@ -0,0 +1,22 @@
+Imports DigitalData.Modules.Logging
+
+Public Class frmChecksum
+    Private LogConfig As LogConfig
+    Private FileEx As DigitalData.Modules.Filesystem.File
+
+    Private Sub frmChecksum_Load(sender As Object, e As EventArgs) Handles MyBase.Load
+        LogConfig = New LogConfig(LogConfig.PathType.Temp)
+        FileEx = New DigitalData.Modules.Filesystem.File(LogConfig)
+    End Sub
+
+    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
+        If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
+            TextBox1.Text = OpenFileDialog1.FileName
+        End If
+    End Sub
+
+    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
+        Dim oChecksum = FileEx.GetChecksum(TextBox1.Text)
+        MsgBox(oChecksum)
+    End Sub
+End Class
\ No newline at end of file
diff --git a/GUIs.Test.TestGUI/frmLookup.vb b/GUIs.Test.TestGUI/frmLookup.vb
index 7a1a3257..39a5fdc9 100644
--- a/GUIs.Test.TestGUI/frmLookup.vb
+++ b/GUIs.Test.TestGUI/frmLookup.vb
@@ -11,7 +11,7 @@ Public Class frmLookup
         InitializeComponent()
 
         ' Fügen Sie Initialisierungen nach dem InitializeComponent()-Aufruf hinzu.
-        Localizer.Active = New LookupGridLocalizer()
+        'Localizer.Active = New LookupGridLocalizer()
     End Sub
 
     Private Sub frmLookup_Load(sender As Object, e As EventArgs) Handles MyBase.Load
diff --git a/GUIs.Test.TestGUI/frmStart.Designer.vb b/GUIs.Test.TestGUI/frmStart.Designer.vb
index 2418a6c7..4bb83fcf 100644
--- a/GUIs.Test.TestGUI/frmStart.Designer.vb
+++ b/GUIs.Test.TestGUI/frmStart.Designer.vb
@@ -26,6 +26,7 @@ Partial Class frmStart
         Me.Button2 = New System.Windows.Forms.Button()
         Me.Button3 = New System.Windows.Forms.Button()
         Me.Button4 = New System.Windows.Forms.Button()
+        Me.Button5 = New System.Windows.Forms.Button()
         Me.SuspendLayout()
         '
         'Button1
@@ -64,11 +65,21 @@ Partial Class frmStart
         Me.Button4.Text = "Skalierungsfaktor"
         Me.Button4.UseVisualStyleBackColor = True
         '
+        'Button5
+        '
+        Me.Button5.Location = New System.Drawing.Point(12, 260)
+        Me.Button5.Name = "Button5"
+        Me.Button5.Size = New System.Drawing.Size(236, 60)
+        Me.Button5.TabIndex = 2
+        Me.Button5.Text = "Button5"
+        Me.Button5.UseVisualStyleBackColor = True
+        '
         'frmStart
         '
         Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
         Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
         Me.ClientSize = New System.Drawing.Size(800, 450)
+        Me.Controls.Add(Me.Button5)
         Me.Controls.Add(Me.Button4)
         Me.Controls.Add(Me.Button3)
         Me.Controls.Add(Me.Button2)
@@ -83,4 +94,5 @@ Partial Class frmStart
     Friend WithEvents Button2 As Button
     Friend WithEvents Button3 As Button
     Friend WithEvents Button4 As Button
+    Friend WithEvents Button5 As Button
 End Class
diff --git a/GUIs.Test.TestGUI/frmStart.vb b/GUIs.Test.TestGUI/frmStart.vb
index d8b40900..ce2fcd0f 100644
--- a/GUIs.Test.TestGUI/frmStart.vb
+++ b/GUIs.Test.TestGUI/frmStart.vb
@@ -18,4 +18,8 @@ Public Class frmStart
 
         MsgBox("Scaling: " & oScreen.GetScreenScaling(Me))
     End Sub
+
+    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
+        frmChecksum.Show()
+    End Sub
 End Class
\ No newline at end of file