Hey thank you for this. For #1 good to know. I would still be looking for solutions.
For #2 as a temporary solution I may check that the file ends in .pdf but what I find is that users have their file in many different formats, so my registration process would have less sticking points if I just accepted whatever they had to give. Is there pre-witten wix code for converting any file type to pdf anywhere. That you know of?