diff --git a/Nake.csx b/Nake.csx
index 3e1fb41..8e278d8 100644
--- a/Nake.csx
+++ b/Nake.csx
@@ -44,7 +44,7 @@ var MSBuildExe = @"$ProgramFiles(x86)$\MSBuild\12.0\Bin\MSBuild.exe";
 {
     Build("Debug", outputPath);
 
-    string tests = new FileSet{@"{outputPath}\*.Tests.dll"};
+    var tests = new FileSet{@"{outputPath}\*.Tests.dll"}.ToString(" ");
     Cmd(@"Packages\NUnit.Runners.2.6.2\tools\nunit-console.exe /framework:net-4.0 /noshadow /nologo {tests}");
 }
 
diff --git a/Source/ProductAssemblyInfo.cs b/Source/ProductAssemblyInfo.cs
index d5bb63f..4753336 100644
--- a/Source/ProductAssemblyInfo.cs
+++ b/Source/ProductAssemblyInfo.cs
@@ -1,5 +1,5 @@
 using System.Reflection;
 
-[assembly: AssemblyVersion("2.1.0.0")]
-[assembly: AssemblyInformationalVersion("2.1.0")]
+[assembly: AssemblyVersion("2.1.1.0")]
+[assembly: AssemblyInformationalVersion("2.1.1")]
 [assembly: AssemblyCopyright("Copyright © Yevhen Bobrov 2013-2014")]
diff --git a/Source/Utility/FileSet.cs b/Source/Utility/FileSet.cs
index 31ee40c..a2ac5a5 100644
--- a/Source/Utility/FileSet.cs
+++ b/Source/Utility/FileSet.cs
@@ -271,7 +271,16 @@ FileSet Transform(Func<Item, Item> transform)
         }
 
         /// <summary>
-        /// Performs an implicit conversion from strign array to <see cref="FileSet"/>.
+        /// Performs conversion from file set to array of <see cref="ITaskItem"/>.
+        /// </summary>
+        /// <returns> The sequence of MSBuild task items </returns>
+        public ITaskItem[] AsTaskItems()
+        {
+            return ((IEnumerable<string>)this).AsTaskItems();
+        }
+
+        /// <summary>
+        /// Performs an implicit conversion from string array to <see cref="FileSet"/>.
         /// </summary>
         /// <param name="arg">The argument.</param>
         /// <returns>
@@ -303,23 +312,25 @@ public static implicit operator string[](FileSet arg)
         }
 
         /// <summary>
-        /// Performs an implicit conversion from file set to array of <see cref="ITaskItem"/>.
+        /// Returns a string that represents the current object.
         /// </summary>
-        /// <param name="arg">The argument.</param>
-        /// <returns> The sequence of MSBuild task items </returns>
-        public static implicit operator ITaskItem[](FileSet arg)
+        /// <returns>
+        /// A string that represents the current object.
+        /// </returns>
+        /// <filterpriority>2</filterpriority>
+        public override string ToString()
         {
-            return arg.ToArray().AsTaskItems();
-        }
-
+            return ToString(" ");
+        }        
+        
         /// <summary>
-        /// Performs an implicit conversion from file set to string.
+        /// Returns a string of resolved concatenated file paths using given separator.
         /// </summary>
-        /// <param name="arg">The argument.</param>
-        /// <returns>  The string with space separated list of resolved file set paths </returns>
-        public static implicit operator string(FileSet arg)
+        /// <param name="separator">Path separator</param>
+        /// <returns>  The string with resolved file set paths separated by given  separator </returns>
+        public string ToString(string separator)
         {
-            return string.Join(" ", arg);
+            return string.Join(separator, this); ;
         }
 
         class Inclusion
diff --git a/Tools/Nake/Meta.dll b/Tools/Nake/Meta.dll
index efd8154..484a932 100644
Binary files a/Tools/Nake/Meta.dll and b/Tools/Nake/Meta.dll differ
diff --git a/Tools/Nake/Meta.pdb b/Tools/Nake/Meta.pdb
index 96582bc..32b7974 100644
Binary files a/Tools/Nake/Meta.pdb and b/Tools/Nake/Meta.pdb differ
diff --git a/Tools/Nake/Nake.exe b/Tools/Nake/Nake.exe
index 1d58723..be5b9fc 100644
Binary files a/Tools/Nake/Nake.exe and b/Tools/Nake/Nake.exe differ
diff --git a/Tools/Nake/Nake.pdb b/Tools/Nake/Nake.pdb
index 99dd1bc..8a4e261 100644
Binary files a/Tools/Nake/Nake.pdb and b/Tools/Nake/Nake.pdb differ
diff --git a/Tools/Nake/Utility.dll b/Tools/Nake/Utility.dll
index 56ba2b1..7be3290 100644
Binary files a/Tools/Nake/Utility.dll and b/Tools/Nake/Utility.dll differ
diff --git a/Tools/Nake/Utility.pdb b/Tools/Nake/Utility.pdb
index 1e62dd2..b9eea67 100644
Binary files a/Tools/Nake/Utility.pdb and b/Tools/Nake/Utility.pdb differ