I have windows live mail on windows 7.Suddenly in my attempt to open attachments, I get a popup that says "invalid image. pdf" it is opening in Picaso. These are documents. I don't know why they are opening in picaso or how to change it back to whatever program should be opening them. Photos open as they should, it's just documents that don't. I tried 'save as' to try to change it. But that doesn't work either.
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