How to Change ppReport1.DeviceType at Runtime?

rbuser

How do you change ppRepor1.DeviceType, during runtime?

I'm trying to change the DeviceType to "ExcelFile" during runtime, but it
will not change.
ppReport1.DeviceType := 'ExcelFile';

Initially ppReport1.DeviceType is set to PDFFile.

using: Delphi 5 Ent. RB 6.03, TExtraDevices

TIA--patrick