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How can I make a File Attachment control conditionally required? For other controls, such as a text box I can add a data validation rule that and's the condition (a checkbox being checked) and the control's isBlank. However, File Attachment controls lack this function (data validation), so how can I emulate it?

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Did you try checking the box Cannot be blank in the properties window?

Right click on the control, properties, Cannot be blank.

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That's not conditional at all though... – C. Ross Jul 8 '11 at 11:07
    
At least in InfoPath 2007, the "cannot be blank" field is disabled for file attachment fields (and disabled in the "on" position). – Allen Gould Jun 6 '12 at 19:43

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