InfoPath Dev

I need to have default values in multiple areas of my form.  The problem is, after a user edits the form and saves it, the next time it is opened those values are refreshed.

Is there a way to add a condition to the default value, so that - if strFilename = "" , then apply the value?

There is a checkbox in the control properties dialog under default values called "Refresh value when formula is recalculated".  Make sure this is unchecked and the value won't be refreshed each time you open the form.