No easy fix found yet - however, I have figured out a difficult fix. Editing the registry -
Modify the value back to 0 causes the message box to become active again.
Not a pretty fix, but at least I can get things working again.
I wish there was a user interface choice to turn the message box back on.
I am having the same issue. Unlike Tom, I'm not 100% sure why this is occuring. So, please excuse my ignorance. Hopefully someone can offer some advice.
It seems to happen on some users computers and not others. Some have reader 9 others have X, some have acrobat pro 8, others X. I can't find a common thread for why it happens for some and not others. Does the pop-up actually refer to the file type and not the "document" (i.e. once it has been ticked and clicked to load one pdx it won't show again for others)? Or is there another reason that it is only happening for some people?
I would really like to save myslef from editing registry values or training people in using the advanced search 'look in' feature if at all possible so any help would be very much appreciated.