A bit of refactoring to be able to find some issue...

GreenshotPlugin/UnmanagedHelpers/SafeIconHandle.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Security;
+using System.Security.Permissions;
+using Microsoft.Win32.SafeHandles;
+
+namespace GreenshotPlugin.UnmanagedHelpers
+{
+    /// <summary>
+    /// A SafeHandle class implementation for the hIcon
+    /// </summary>
+    public class SafeIconHandle : SafeHandleZeroOrMinusOneIsInvalid {
+
+        /// <summary>
+        /// Needed for marshalling return values
+        /// </summary>
+        [SecurityCritical]
+        public SafeIconHandle() : base(true)
+        {
+        }
+
+
+        public SafeIconHandle(IntPtr hIcon) : base(true) {
+            SetHandle(hIcon);
+        }
+
+        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
+        protected override bool ReleaseHandle() {
+            return User32.DestroyIcon(handle);
+        }
+    }
+}