Hello, I'm currently using the 64-bit Adobe Reader installed as App:C:\Program Files\WindowsApps\Adobe.Inc.Acrobat.Reader.DC_21.5.20048.0_x64__2kwj4jv5edp0w\Reader What Values do I need to change in regedit to enable PDF preview in Outlook 365?Computer\HKEY_CLASSES_ROOT\.pdf Thank you in advance.

Outlook: Problem with PDF Preview Handler - TechNet Articles - United States (English) - TechNet Wiki 3. Making Sure That "PDF Preview Handler" is EnabledIn Outlook, navigate through “File > Options > Trust Center > Trust Center settings > Attachment Handling” and:Make sure that “Turn off Attachment Preview” box is unchecked.Click “Attachment and Document Previewers” button and check if “PDF Preview Handler” is enabled/ticked in the list in the opened window. When I check the list it doesn't provide an PDF Preview Handler instead only an PDF-XChange Preview Handler.How to install the PDF Preview Handler?

D

default5kue4kpyfpsa

Known Participant

Answered

How to fix PDF preview in Outlook 365?

Forum|Forum|4 years ago
October 22, 2021
6 replies
102755 views

Hello,

I'm currently using the 64-bit Adobe Reader installed as App:

C:\Program Files\WindowsApps\Adobe.Inc.Acrobat.Reader.DC_21.5.20048.0_x64__2kwj4jv5edp0w\Reader

What Values do I need to change in regedit to enable PDF preview in Outlook 365?

Computer\HKEY_CLASSES_ROOT\.pdf

Thank you in advance.

Correct answer FlytÅge

For me, the problem was solved by changing a setting in Powertoys. Under "File Explorer add-ons", try to disable "Enable PDF (.pdf) preview"

P

Peter25227529uepn

Participating Frequently

In Outlook, navigate through “File > Options > Trust Center > Trust Center settings > Attachment Handling” and:
- Make sure that the “Turn off Attachment Preview” box is unchecked.
- Click the “Attachment and Document Previewers” button and check if “PDF Preview Handler” is enabled/ticked in the list in the opened window.

Regards,

Peter

D

Damien27125879ck9e

New Participant

I check it and “PDF Preview Handler” is enabled but i have 2 “PDF Preview Handler” ....
it doesn't work :'(

A

ageped

New Participant

Disable "Enable PDF (.pdf) preview"

F

FlytÅgeCorrect answer

New Participant

For me, the problem was solved by changing a setting in Powertoys. Under "File Explorer add-ons", try to disable "Enable PDF (.pdf) preview"

B

BabakBani

New Participant

Thank you! This was the solution for the problem that has been plaguing our business machines for months!!

I expected it was an update that Microsoft put out for Outlook 365 that broke the preview handler functionality.

The culprit all along was MS PowerToys.

I reposted your solution with back reference to:

1) Outlook 365 support group: https://answers.microsoft.com/en-us/outlook_com/forum/all/outlook-365-not-showing-pdf-preview/c30ca3c5-be3e-48af-99f8-08b9b06da67f

2) Reddit, Outlook group: https://www.reddit.com/r/Outlook/comments/tkod6y/having_trouble_previewing_pdfs_in_outlook_365/

3) MS PowerToys Github, filed an issue: https://github.com/microsoft/PowerToys/issues/17221

Thank you!

F

FlytÅge

New Participant

This has been a nightmare for me. I'm glad I could contribute to solve your problem as well.

D

default5kue4kpyfpsaAuthor

Known Participant

Outlook: Problem with PDF Preview Handler - TechNet Articles - United States (English) - TechNet Wiki

3. Making Sure That "PDF Preview Handler" is Enabled

In Outlook, navigate through “File > Options > Trust Center > Trust Center settings > Attachment Handling” and:

Make sure that “Turn off Attachment Preview” box is unchecked.
Click “Attachment and Document Previewers” button and check if “PDF Preview Handler” is enabled/ticked in the list in the opened window.

When I check the list it doesn't provide an PDF Preview Handler instead only an PDF-XChange Preview Handler.

How to install the PDF Preview Handler?

D

default5kue4kpyfpsaAuthor

Known Participant

4. Manually Creating Required Adobe Reader-related Registry Records

This is the most common cause of the problem. Adobe Reader may not have created the required registry record in 64-bit Windows or it might be corrupted. In order to fix it, you'll need to create the required registry value manually:

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}
Value name: AppID
Value type: REG_SZ
Value: {534A1E02-D58F-44f0-B58B-36CBED287C7C}

Have a backup of the registry first. Making a mistake in registry can lead to unexpected and serious problems, so doing this beforehand is highly recommended:
https://support.microsoft.com/tr-tr/help/322756/how-to-back-up-and-restore-the-registry-in-windows
Copy the text below and paste it to a notepad, then save it with a name like PDFPreviewHandler.reg as a REG file:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Classes\CLSID\{DC6EFB56-9CFA-464D-8880-44885D7DC193}]
"AppID"="{534A1E02-D58F-44f0-B58B-36CBED287C7C}"

Double-click on the REG file to merge it. After that, the corresponding value in registry will look like this:
Restart your computer.

When I navigate in regedit.exe to the target key

Computer\HKEY_CLASSES_ROOT\AppID\{534A1E02-D58F-44f0-B58B-36CBED287C7C}

it shows the following entry:

Name ; Type ; Data
(Default) ; REG_SZ ; 32-bit Preview Handler Surrogate Host
DllSurrogate ; REG_EXPAND_SZ ; C:\Windows\SysWOW64\prevhost.exe


Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\AppID\{534A1E02-D58F-44f0-B58B-36CBED287C7C}]
@="32-bit Preview Handler Surrogate Host"
"DllSurrogate"=hex(2):43,00,3a,00,5c,00,57,00,69,00,6e,00,64,00,6f,00,77,00,73,\
  00,5c,00,53,00,79,00,73,00,57,00,4f,00,57,00,36,00,34,00,5c,00,70,00,72,00,\
  65,00,76,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,00,00