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https://blog.it-kb.ru/2010/02/19/%d1%81%d0%be%d0%b7%d0%b4%d0%b0%d0%bd%d0%b8%d0%b5-%d0%bf%d1%80%d0%b8%d0%b2%d1%8f%d0%b7%d0%ba%d0%b8-%d0%b8%d0%ba%d0%be%d0%bd%d0%be%d0%ba-%d0%bf%d1%80%d0%b8%d0%bb%d0%be%d0%b6%d0%b5%d0%bd%d0%b8%d0%b9/
Создание привязки иконок приложений для новых типов файлов в библиотеках документов SharePoint Server 2007