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?

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default5kue4kpyfpsa

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Answered

How to fix PDF preview in Outlook 365?

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

Participant

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

A

ageped

Participant

Disable "Enable PDF (.pdf) preview"

F

FlytÅgeCorrect answer

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

BruteL

Participant

Thank you, Åge! Have been googling all over the place and have been looking at all kinds of suggested reg. edit. fixes reg., but my registry was fine. Disabled Enable PDF preview in Power Toys and just like that I was able to preview my PDFs in Outlook again! (Updated Power Toys today to 0.56.2 - the update must have changed a setting or messed something up.)

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

D

default5kue4kpyfpsaAuthor

Known Participant

When I open Windows 10 Settings → Default apps → Set defaults by app → Acrobat Reader DC → Manage

it shows that it has all assigned.

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Test Screen Name

Legend

You need to install Acrobat Reader DC. Not Reader Touch.

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Test Screen Name

Legend

Run Reader. Look in ABOUT in the usual way. It will tell you if it's 32-bit or 64-bit. But you could also see whether it's installed in Program Files or Program Files (X86). Only it looks like you installed it from the Microsoft Store. It's only been there a few days, I think, all bets are off. Personally, I'd get rid of it and install Adobe's download.