How to Enable the Preview of PDF Files in 64-bit Windows 7
Contributed by Rob Rogers 
Tagged: Microsoft Windows 7 If you are running the 64-bit version of Windows 7 (or Vista), you will find that your PDF files do not preview in Windows Explorer as they do in the 32-bit versions. Instead, all you see is a message stating that This file can’t be previewed. To enable this functionality on your 64-bit operating system, follow these steps.
1. Click the Orb (Start Button).
2. Go to the Search programs and files textbox and input regedit.
3. Select regedit.exe from the results.
4. When the UAC prompt appears, click the Yes button.
5. In the left pane of the Registry Editor, go to (and select):
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}
6. In the right pane, locate AppID.
7. Change AppID value to {534A1E02-D58F-44f0-B58B-36CBED287C7C}.
8. Restart your computer for the change to take affect.
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Anonymous said on April 13, 2010
Thank you so much for sharing this..I was looking exactly for it !!
Al_F said on May 25, 2010
Shamanstears,
Do you have a fix for Word 2003 previews in Win7 64 bit??
Bailandonreina said on June 26, 2010
Thank you! I was so annoyed!
Trent D. Miller said on July 27, 2010
I love things that work. And this is one of those things.
Thank You
Japanbridge said on August 31, 2010
Didn’t work!
Haroldf747 said on September 10, 2010
This has annoyed me for months. This is a great simple fix. Thanks!
Lotusdevi said on November 1, 2010
Bugger I only get Default reg-sz in the right pane aaagghhrrr so frustrating ;(
M_keramati_ir said on December 5, 2010
Hi! I have not this on my registry !. Can’t find it . Pls tell me what I must do.
Anonymous said on December 5, 2010
If you don’t have that key, you can create it by right clicking on its parent folder->New key. Hope this help :)
Jorge said on May 20, 2011
Thank you very much!!!!!!!!!!!!!!!!!
A grateful user said on June 7, 2011
Absolutely awesome!!!
Thank you.
But now, we must wonder… what was the command we replaced?
And, is there a similar fix to allow us to preview various photo files in the preview screen?
And finally, quite rhetorically, why the F didn’t microsoft just do this for us?
Karen said on August 31, 2011
Thank you so much for posting this fix. I have been looking all day for this fix. You’re a genious :-).