Hi,
Your folder link URL is correct. However, "A Folder Link option was added to the context menu for public folders and categories. It generates a URL link for the folder or category that you can send to recipients" since "SAP BusinessObjects Business Intelligence Platform 4.1 Support Package 3". See page 8 of SAP BusinessObjects Business Intelligence Platform
Document Version: 4.1 Support Package 3 - 2014-03-26 Business Intelligence Launch Pad User Guide
Hope this helps,
Jin-Chong