Why do I get pdf files with an underscore in the extension ( ._pdf)

Why do I get pdf files with an underscore in the extension ( ._pdf) and how do I open them when they are email attachemnts, becuase it wont let me rename it or save it as any other version.

Not sure. What email are you using? Gmail (or web based email) by chance?
Definitely not a Reader issue if you can see the underscore in your email.
You can try saving it as is then try renaming it using Windows Explorer to see if that works.

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>> Why won't some pdf-files open on tablet/phone? created by Romil
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Why do I get pdf files with an underscore in the extension ( ._pdf)

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