I have tried this and it works very well, but it will not let me save the completed form, even though it had created a unique file name as per your instructions. It said that:
InfoPath cannot submit the form.
An error occurred while the form was being submitted.
The form cannot be submitted to the following location:
The folder does not exist.
Do you have any idea how I can solve this?
Same experience with david. i have finished the form and already posted it in sharepoint site however, if i have completed the form it doesnt allow me to submit it: the error message are as follows: