Permission Denied Script.js print button

[Wob]

I have set up a 'print this form' button using the command
XDocument.PrintOut("c:\temp\testform.xns")

Whether I use the preview form or the form I have published in the location
above it gives the error 'Permission Denied File:script.js Line:24'

The folder containing the form is shared with no restrictions on it at all.
Where am I going wrong?

Wob.

InfoPath 2003