How to export a view in Excel format?
As an alternative to the module you are using, try the PHPExcel module. Some details about it (from its project page):

The PHPExcel module allows developers to export/import data to/from real Excel files.
The idea behind this module is to have a single module for handling the export or import of Excel files, instead of multiple modules handling specific cases.
The module provides no functionality as-is (the .module file is as good as empty). The phpexcel.inc file must be included to use the export or import functions in your own module.