Unable to open some pdf files

Hi there. Sorry to bother you guys but i'm really puzzled about something. Recently I've had problems opening some pdf files (they open fine on a pc). When i try to open it, the preview window opens but i am told "For the best experience, open this PDF portfolio in Acrobat 9 or Adobe Reader 9, or later." I have on several occasions downloaded the latest version, but this does not seem to solve the problem. Does anyone have any suggestions? BTW I am using a macbook running on leopard. Thanks!

I don't know where bubbles went, but this just happened to me for the first time EVER using Mac OS X. I just received a pdf from a co-worker that gives me the  "For the best experience, open this PDF portfolio in Acrobat 9 or Adobe Reader 9, or later." when trying to open it with Preview. Like I said, I've never had Preview fail to open a pdf before. Has this been seen before? Is there something new r different about how this pdf might have been created that Preview doesn't handle?
I had recently downloaded a demo of YNAB (You Need A Budget) which also installed Adobe AIR (ugh). Thinking that might have changed something, I uninstalled AIR, rebooted, but no change. This pdf is still unopenable in Preview.
BTW, I am totally uninterested in installing Reader on my system and am hoping I can deal with this singularity.
Thanks to anyone with any insight...

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