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Level 10

I couldn't test it in Acrobat 8 Pro but I did try it in Reader 8 after Reader Extending the pdf to allow file attachments but it wouldn't work (I've got an empty WinXP VM with Reader 8 for testing).

It wouldn't work in Acrobat 9 with a straight drag and drop but it did work if I opened the Pages palette and dragged the file onto the palette. Acrobat complains about XFA but allows the page addition, I'm guessing this works because it's a Static XFA form, I just tried a Dynamic form and it wouldn't work.

I don't have Acrobat 10 at work to try it, so try the Pages palette in Acrobat X and see if that works.