Access the samples via the Code Exchange and the download functionality will work correctly. In this case, the Code Exchange URL for this sample is:<a href="http://edn.esri.com/index.cfm?fa=codeExch.sampleDetail&pg=/arcobjects/9.1/Samples/Controls/TOCControl/ContentsView/ContentsView.htm" target="_blank">http://edn.esri.com/index.cfm?fa=codeExch.sampleDetail&pg=/arcobjects/9.1/Samples/Controls/TOCControl/ContentsView/ContentsView.htm</a>