on this page in the release notes of jqgrid 3.7.2, i see:
Fix export url in export to excel method
but i dont see any other documention abou
Here's a walkthrough of how to add an "Export to Excel" button to your jqGrid, which will write to a real Excel file.
http://www.codeproject.com/Articles/784342/Export-data-from-jqGrid-into-a-real-Excel-file
(Note that this only works if you're using Visual Studio, as it uses the Microsoft OpenXML libraries.)