Rails - Apr 2009 - File created using Spreadsheet Excel can't read on linux

Hi All,
  Created xls file using spreadsheet Excel is not read on linux.

I am creating an xls file are as follows

workbook = Spreadsheet::Excel.new("Filepath")
worksheet = workbook.add_worksheet("Sheet1")
       |
       |
       |
workbook.close


but when i am trying to download this it not get download.
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