Error opening file: "The file format differs from the format that the file name extension specifies" in Excel

Hello guys,

Can you please solve this problem for me..i have attached an excel sheet too..
''Error when opening an Excel file: "The file you are trying to open, '.xls.xls', is in a different format than specified by the file extension. Verify that the file is not corrupted and is from a trusted source before opening the file..."

Please help
Thanks