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>What does this mean?
It means either:
A. The file has been damaged (corrupted) for whatever reason or;
B. You're trying to use Reader to open a file that is not a PDF file which is the only thing Reader will open.
If they are not PDF files, are you actually trying to use Reader to open them or are you double clicking them and Reader is automatically trying to open them?
If the first, don't do that. If it's the latter, the you need to change your file associations so that your OS knows what to use to open the files.
PDF's should be in a zip file in order to email otherwise they often get corrupted.