After upgrading to Adobe Acrobat Reader 10.0.1+ archived .PDF files can no longer be opened while they can be opened with other software or previous versions of the software.
There was an error opening this document. Access is denied.
1. Open the Adobe application, click on Edit > Preferences > Security (Enhanced).
For more information on Protected Mode and Protected View please refer to the following article:
This happens when accessing files archived by Enterprise Vault on a network share when mounted as a mapped network location with a drive letter assigned.