diff --git a/Sources/ThreatsManager.Engine/Manager.cs b/Sources/ThreatsManager.Engine/Manager.cs
index eaf460e1..1bb4b0cc 100644
--- a/Sources/ThreatsManager.Engine/Manager.cs
+++ b/Sources/ThreatsManager.Engine/Manager.cs
@@ -213,11 +213,27 @@ private bool CheckVersion([NotNull] Version platformVersion, [NotNull] Assembly
                             switch (attribute.ConstructorArguments.Count)
                             {
                                 case 1:
-                                    attrib = new ExtensionsContainerAttribute(attribute.ConstructorArguments[0].Value.ToString());
+                                    attrib = new ExtensionsContainerAttribute((string) attribute.ConstructorArguments[0].Value);
                                     break;
                                 case 2:
-                                    attrib = new ExtensionsContainerAttribute(attribute.ConstructorArguments[0].Value.ToString(),
-                                        attribute.ConstructorArguments[1].ToString());
+                                    if (attribute.ConstructorArguments[1].ArgumentType == typeof(string))
+                                    {
+                                        attrib = new ExtensionsContainerAttribute(
+                                            (string) attribute.ConstructorArguments[0].Value,
+                                            (string) attribute.ConstructorArguments[1].Value);
+                                    }
+                                    else
+                                    {
+                                        attrib = new ExtensionsContainerAttribute(
+                                            (string) attribute.ConstructorArguments[0].Value,
+                                            (uint) attribute.ConstructorArguments[1].Value);
+                                    }
+                                    break;
+                                case 3:
+                                    attrib = new ExtensionsContainerAttribute(
+                                        (string) attribute.ConstructorArguments[0].Value,
+                                        (string) attribute.ConstructorArguments[1].Value,
+                                        (uint) attribute.ConstructorArguments[2].Value);
                                     break;
                             }
 
diff --git a/Sources/ThreatsManager.Interfaces/ExtensionsContainerAttribute.cs b/Sources/ThreatsManager.Interfaces/ExtensionsContainerAttribute.cs
index 4a8cabd4..db8a6b41 100644
--- a/Sources/ThreatsManager.Interfaces/ExtensionsContainerAttribute.cs
+++ b/Sources/ThreatsManager.Interfaces/ExtensionsContainerAttribute.cs
@@ -13,9 +13,17 @@ public class ExtensionsContainerAttribute : Attribute
         /// Constructor to describe dependency with a specific version of the Engine.
         /// </summary>
         /// <param name="version">Version of the Engine.</param>
-        public ExtensionsContainerAttribute([Required] string version) : this(version, version)
+        public ExtensionsContainerAttribute([Required] string version) : this(version, version, 0)
         {
+        }
 
+        /// <summary>
+        /// Constructor to describe dependency with a specific version of the Engine.
+        /// </summary>
+        /// <param name="version">Version of the Engine.</param>
+        /// <param name="clientId">Client Identifier.</param>
+        public ExtensionsContainerAttribute([Required] string version, uint clientId) : this(version, version, clientId)
+        {
         }
 
         /// <summary>
@@ -23,10 +31,21 @@ public ExtensionsContainerAttribute([Required] string version) : this(version, v
         /// </summary>
         /// <param name="minVersion">Minimum supported versions of the Engine.</param>
         /// <param name="maxVersion">Maximum supported versions of the Engine.</param>
-        public ExtensionsContainerAttribute([Required] string minVersion, [Required] string maxVersion)
+        public ExtensionsContainerAttribute([Required] string minVersion, [Required] string maxVersion) : this(minVersion, maxVersion, 0)
+        {
+        }
+
+        /// <summary>
+        /// Constructor to describe dependency with a range of versions of the Engine.
+        /// </summary>
+        /// <param name="minVersion">Minimum supported versions of the Engine.</param>
+        /// <param name="maxVersion">Maximum supported versions of the Engine.</param>
+        /// <param name="clientId">Client Identifier.</param>
+        public ExtensionsContainerAttribute([Required] string minVersion, [Required] string maxVersion, uint clientId)
         {
             MinVersion = minVersion;
             MaxVersion = maxVersion;
+            ClientId = clientId;
         }
 
         /// <summary>
@@ -39,6 +58,13 @@ public ExtensionsContainerAttribute([Required] string minVersion, [Required] str
         /// </summary>
         public string MaxVersion { get; set; }
 
+        /// <summary>
+        /// Client Identifier.
+        /// </summary>
+        /// <remarks>If the Client Id is not 0, then the Extension Container requires a special client to be executed.
+        /// <para><b>This is not a security feature!</b></para></remarks>
+        public uint ClientId { get; set; }
+
         /// <summary>
         /// Checks if the Extension supports the version of the Engine passed as argument.
         /// </summary>
diff --git a/Sources/ThreatsManager.Interfaces/MicrosoftContainerAttribute.cs b/Sources/ThreatsManager.Interfaces/MicrosoftContainerAttribute.cs
deleted file mode 100644
index 464fa769..00000000
--- a/Sources/ThreatsManager.Interfaces/MicrosoftContainerAttribute.cs
+++ /dev/null
@@ -1,12 +0,0 @@
-using System;
-
-namespace ThreatsManager.Interfaces
-{
-    /// <summary>
-    /// Attribute to be applied to the Assembly to characterize it as a container reserved for Microsoft internal consumption. 
-    /// </summary>
-    [AttributeUsage(AttributeTargets.Assembly)]
-    public class MicrosoftContainerAttribute : Attribute
-    {
-    }
-}
\ No newline at end of file