I don't see anything under Support Activity in My Account.

I have to back track, it does give an error on xls as well but not a corruption error. Says that data could be lost.

ExportExcelErrorTest.zipI have narrowed it down to the InitializeColumn event for the excel export where the column format is assigned to the excel format.

This works if I am exporting to a .xls file format but gives a file corrupted if trying to export to .xlsx.

I have tried to upload a sample that shows how the error is cause. Can I email it to you?