When trying to export the underlying data from a graph in .xlsx format the resulting spreadsheet cannot be opened by Excel 2010. We get the error message invalid file exstension. When exporting the same underlying data to .xls format the resulting spreadsheet can be opened with Excel 2010 but shows the error message shown beneath:

<div style='display:none'>

STATUS_MESSAGE_START

Sorry, you cannot export this data into Excel, as it contains more than one million cell values.

STATUS_MESSAGE_END

ERRORNUMCODE_START

7806

ERRORNUMCODE_END

ERRORCODE_START

XLS_CELL_LIMIT_EXCEEDS

ERRORCODE_END

ERRORINSTANCE_START

null

ERRORINSTANCE_END

RESPONSE_STATUS_START

__ERROR__PAGE

RESPONSE_STATUS_END

HTTP_STATUS_CODE_START

400

HTTP_STATUS_CODE_END</div> We have tried this on IE 10 and Google Chrome but the results are the same. When downloading the same underying data too CSV and then converting to Excel there is no problem.