Microsoft Excel *.xlsx or PowerPoint *.pptx files in a folder protected by Symantec File Share encryption cannot be opened when McAfee VirusScan Enterprise 8.8 patch 2 or above is also installed.
Excel *.xlsx and PowerPoint *.pptx files either cannot be opened or the user is informed that the file is corrupt.
The problem was introduced with a design change in McAfee VirusScan Enterprise 8.8 patch 2 where the vendor moved from a "Legacy Filter Driver" to the "Minifilter Driver Model". Symantec File Share Encryption (PGP NetShare) uses the Legacy Filter Driver model, which is no longer supported by McAfee 8.8 patch 2 and above. For further information see the McAfee Knowledge Center.
Upgrade to Encryption Desktop 10.4 MP1 or above.
Alternatively, the following workarounds exist: