Problem opening some PDF files in Adobe Acrobat

I have several PDF files that cannot be open in Adobe Acrobat.  I have the message as shown below:
There was an error opening this document. The file is damaged and could not be repaired.
But I first discovered the problem in Adobe Reader: the files cannot be open in neither Adobe Reader 9, X nor XI, in Win7 64-bit as well as Windows Server 2008 R2.  The original post in Adobe Reader forum is in this link: http://forums.adobe.com/message/6163936
BUT the files are NOT damaged because I can open them with another software called XChange PDF Viewer.
Where can I file a bug to Adobe so they can fix the bug?
Thanks in advance.

The Acrobat Family complies with the ISO standard for parsing PDF files, and it will reject files that contain unrecoverable errors. Third-party applications may decide to ignore the errors or display the corrupted content anyway, but that's their decision.

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