Hello Rtutus,

Thank you for posting in the community.

The content type used by the excel exporter is by default"application/ms-excel". In case this post is related to one of your other threads:

http://es.infragistics.com/community/forums/t/83720.aspx

please note that I am following that discussion, therefore feel free to contact me through the exporting thread directly.

Thank you for choosing Infragistics.

Do not hesitate to contact me with any updates or questions.