Adobe takes the security of our products and technologies very seriously; we are therefore always listening to and evaluating ways to allow end-users and administrators to better manage and configure features like this one to mitigate potential associated risks. We are currently researching the best approach for this functionality in Adobe Reader and Acrobat, which we could conceivably make available during one of the regularly scheduled quarterly product updates.
As we investigate this, users can use the following method to further mitigate against this risk. For consumers, open up the Preferences panel and click on "Trust Manager" in the left pane. Clear the check box "Allow opening of non-PDF file attachments with external applications" as shown below.
Pict Adobe guide
For administrators who wish to accomplish this with a registry setting on Windows, add the following DWORD value to:
HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\9.0\Originals
Name: bAllowOpenFile
Type: REG_DWORD
Data: 0
Furthermore, an administrator can grey out the preference to keep end-users from turning this capability on, by adding the following DWORD value to: HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\9.0\Originals
Name: bSecureOpenFile
Type: REG_DWORD
Data: 1
Note:
These samples assumed you were adding registry settings to Adobe Reader 9. For Adobe Acrobat, you would replace "Acrobat Reader" with "Adobe Acrobat", and for a different version, you would substitute its value for "9.0".
