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Export Multisheet Excel from using Apex and Visualforce Page

I have tried exporting data to excel using Visualforce and apex without multisheet. It works perfectly. But when I try to export data to multisheet excel it doesn't work. I'm getting `The file is corrupt or can't be open`. I referred following blogs, but none of them worked, all are having the same issue.
1. http://www.sfdcpoint.com/salesforce/export-excel-multiple-worksheets-visualforce/
2. https://eltoro.secure.force.com/CreateExcelFilesWithMultipleTabs