InfoPath Dev

1. How do you open a form in read only mode from a sharepoint library? This would be the desired option 2. Setting the ''Do nothing'' option will not work because we get an xml error and the form will not display.

I have a library of infopath forms in Sharepoint that I don#%92t want to update the underline xml when I publish a new form. The reason for this I have digitally signed the old forms and I don#%92t want to lose the signatures when I publish new forms with different xml schema. Is it possible to prevent this behavior.