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Message: <blockquote data-quote="Q3aiml" data-source="post: 7531">Hey Frodo, found out the source of the problem.  BinarySearch assumes a sorted list, so it was only by chance that the order allowed it to work in My Videos but not Pictures.Fix: [code]public void SetExtensions(ArrayList extensions){     if (extensions==null) return;     m_extensions = extensions;     m_extensions.Sort();}[/code][code]public void AddExtension(string strExtension){     if (m_extensions == null)          m_extensions = new ArrayList();     m_extensions.Add(strExtension);     m_extensions.Sort();}[/code]Unfortunately now any speed improvements are lost.  Scratch this as an improvement.</blockquote>