How to fix Adobe PDF preview in 64 bit Windows

This will fix previews in both Outlook and Windows explorer on Windows 7 64 bit machines.

If you get

This file cannot be previewed because of an error with the following previewer: PDF Preview Handler for Vista

in outlook when trying to preview PDF’s or just get no previews of PDF’s in explorer..

..then try the following.

Caution: Changing the registry should be done with great care…so make a backup of any changes!

  1. Start the Registry editor by using Start->Run (or Windows Key + R) and type regedit and click OK
  2. Expanding the tree to locate
    HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193} and select it.
  3. Now to make a backup of the previous settings just in case this does not work for you, right-click on the branch in the left pane and select export. Choose a location you can find again later (just in case! Although you should do this for any registry changes too.). You only need to export the selected branch. Windows 7 automatically takes full registry snapshot in case of major problems.
  4. Now on the right hand side double-click to edit the AppID value and change it to {534A1E02-D58F-44f0-B58B-36CBED287C7C}.
  5. I preview started working immediately even without restarting outlook! However you may need to restart?

Now, I can’t take credit for this brilliant solution. I found it at and only write it again here to make it easier to find for all! Why adobe don’t fix this I am not sure!

2 thoughts on “How to fix Adobe PDF preview in 64 bit Windows

  1. It worked! One slight glitch with the instructions though–in my version of Win7 Home Version, the registry variable was “ProgID” instead of “AppID”. Prior to making the change I did update to the latest version of Adobe Reader XI (11). Thanks so much for posting this.

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