diff --git a/.vs/LogWriter.git/v16/.suo b/.vs/LogWriter.git/v16/.suo
index d73df10..bb1ad9b 100644
Binary files a/.vs/LogWriter.git/v16/.suo and b/.vs/LogWriter.git/v16/.suo differ
diff --git a/LogWriter/LogWriter.cs b/LogWriter/LogWriter.cs
index db61412..2886a41 100644
--- a/LogWriter/LogWriter.cs
+++ b/LogWriter/LogWriter.cs
@@ -341,11 +341,25 @@ namespace Eugen.ESystem.IO
             {
                 if (this.path[this.path.Length - 1] != System.IO.Path.DirectorySeparatorChar)
                 {
-                    fileName = String.Concat(path, System.IO.Path.DirectorySeparatorChar, this.filename, ".log");
+                    if (String.IsNullOrEmpty(System.IO.Path.GetExtension(this.filename)))
+                    {
+                        fileName = String.Concat(path, System.IO.Path.DirectorySeparatorChar, this.filename, ".log");
+                    }
+                    else
+                    {
+                        fileName = String.Concat(path, System.IO.Path.DirectorySeparatorChar, this.filename);
+                    }
                 }
                 else
                 {
-                    fileName = String.Concat(this.path, this.filename, ".log");
+                    if (String.IsNullOrEmpty(System.IO.Path.GetExtension(this.filename)))
+                    {
+                        fileName = String.Concat(this.path, this.filename, ".log");
+                    }
+                    else
+                    {
+                        fileName = String.Concat(this.path, this.filename);
+                    }
                 }
             }
             
diff --git a/LogWriter/bin/Debug/helogwri.dll b/LogWriter/bin/Debug/helogwri.dll
index 86ffc44..9dd8069 100644
Binary files a/LogWriter/bin/Debug/helogwri.dll and b/LogWriter/bin/Debug/helogwri.dll differ
diff --git a/LogWriter/bin/Debug/helogwri.pdb b/LogWriter/bin/Debug/helogwri.pdb
index d7a6896..1454d86 100644
Binary files a/LogWriter/bin/Debug/helogwri.pdb and b/LogWriter/bin/Debug/helogwri.pdb differ
diff --git a/LogWriter/obj/Debug/helogwri.dll b/LogWriter/obj/Debug/helogwri.dll
index 86ffc44..9dd8069 100644
Binary files a/LogWriter/obj/Debug/helogwri.dll and b/LogWriter/obj/Debug/helogwri.dll differ
diff --git a/LogWriter/obj/Debug/helogwri.pdb b/LogWriter/obj/Debug/helogwri.pdb
index d7a6896..1454d86 100644
Binary files a/LogWriter/obj/Debug/helogwri.pdb and b/LogWriter/obj/Debug/helogwri.pdb differ
diff --git a/Test_LogWriter/Form1.cs b/Test_LogWriter/Form1.cs
index 6dc49f5..e07afa1 100644
--- a/Test_LogWriter/Form1.cs
+++ b/Test_LogWriter/Form1.cs
@@ -135,7 +135,7 @@ namespace Test_LogWriter
             logWriter1.WriteMessage("Das ist ein Test");
 
             //Variante 2 - Logdateiname wird angegeben, z.B. 'my_logfile.log'
-            var logWriter2 = new LogWriter(@"C:\TMP\", "my_logfile2");
+            var logWriter2 = new LogWriter(@"C:\TMP\", "my_logfile2.log");
             logWriter2.WriteMessage("Das ist Test 2");
 
             //Variante 3 - Logdateiname wird angegeben und Header wird geschrieben
diff --git a/Test_LogWriter/bin/Debug/Test_LogWriter.exe b/Test_LogWriter/bin/Debug/Test_LogWriter.exe
index 27dd99e..19f9654 100644
Binary files a/Test_LogWriter/bin/Debug/Test_LogWriter.exe and b/Test_LogWriter/bin/Debug/Test_LogWriter.exe differ
diff --git a/Test_LogWriter/bin/Debug/Test_LogWriter.pdb b/Test_LogWriter/bin/Debug/Test_LogWriter.pdb
index a4547fe..0ed75d2 100644
Binary files a/Test_LogWriter/bin/Debug/Test_LogWriter.pdb and b/Test_LogWriter/bin/Debug/Test_LogWriter.pdb differ
diff --git a/Test_LogWriter/bin/Debug/helogwri.dll b/Test_LogWriter/bin/Debug/helogwri.dll
index 86ffc44..9dd8069 100644
Binary files a/Test_LogWriter/bin/Debug/helogwri.dll and b/Test_LogWriter/bin/Debug/helogwri.dll differ
diff --git a/Test_LogWriter/bin/Debug/helogwri.pdb b/Test_LogWriter/bin/Debug/helogwri.pdb
index d7a6896..1454d86 100644
Binary files a/Test_LogWriter/bin/Debug/helogwri.pdb and b/Test_LogWriter/bin/Debug/helogwri.pdb differ
diff --git a/Test_LogWriter/obj/Debug/Test_LogWriter.csproj.AssemblyReference.cache b/Test_LogWriter/obj/Debug/Test_LogWriter.csproj.AssemblyReference.cache
index 5acd535..0bff807 100644
Binary files a/Test_LogWriter/obj/Debug/Test_LogWriter.csproj.AssemblyReference.cache and b/Test_LogWriter/obj/Debug/Test_LogWriter.csproj.AssemblyReference.cache differ
diff --git a/Test_LogWriter/obj/Debug/Test_LogWriter.exe b/Test_LogWriter/obj/Debug/Test_LogWriter.exe
index 27dd99e..19f9654 100644
Binary files a/Test_LogWriter/obj/Debug/Test_LogWriter.exe and b/Test_LogWriter/obj/Debug/Test_LogWriter.exe differ
diff --git a/Test_LogWriter/obj/Debug/Test_LogWriter.pdb b/Test_LogWriter/obj/Debug/Test_LogWriter.pdb
index a4547fe..0ed75d2 100644
Binary files a/Test_LogWriter/obj/Debug/Test_LogWriter.pdb and b/Test_LogWriter/obj/Debug/Test_LogWriter.pdb differ