In June 2026, .pdf files in windows11 file explorer preview pane appear then disappear

Question

In June 2026, .pdf files in windows11 file explorer preview pane appear then disappear

Ken Gosse 20

As of June 22, 2026, my .pdf files in windows 11 Home (24H2, build 26100.8655) File Explorer's preview pane appear for a moment then disappear. It doesn't matter whether I created a .pdf from a Word doc on my PC or whether I downloaded a .pdf then set the Properties to Unblock the file. The previous Windows update finally allowed .pdf files to display immediately once they were Unblocked. Four updates were installed on June 9th, but I did not have this problem until today.

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Answer accepted by question author

Emma1-N 13,150 Microsoft External Staff Moderator

Welcome Ken Gosse,

I understand how frustrating it can be when PDF files briefly appear in the File Explorer Preview pane and then disappear on Windows 11 Home 24H2 (Build 26100.8655).

Before proceeding, could you please clarify:

Which application is currently set as the default PDF viewer (Microsoft Edge, Adobe Acrobat Reader, or another PDF application)?
Does the issue occur with all PDF files or only with files stored in a specific location (for example, Downloads, OneDrive, or a network folder)?

In the meantime, you can try these workaround steps below to troubleshoot the issue:

Option 1: Restart the Explorer process

Press Ctrl + Shift + Esc to open Task Manager
Locate Windows Explorer
Right-click it and select Restart

Option 2: Test with a different default PDF application

Open Settings > Apps > Default apps
Search for .pdf
Temporarily switch the default application to another PDF viewer and test the Preview pane again

Option 3: Clear File Explorer cache

Open File Explorer Options
Under the General tab, click Clear in the Privacy section
Close and reopen File Explorer

Option 4: Check Preview Pane settings

Open File Explorer
Select View > Show
Confirm that Preview pane is enabled
Disable it, close File Explorer, then enable it again

Option 5: Run System File Checker

Open Command Prompt as Administrator
Run: sfc /scannow
Restart the device after the scan completes

I hope the steps above help you deal with your issue.

P.S: If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Ken Gosse 20 Reputation points

2026-06-23T05:12:05.3033333+00:00
The issue appears to have been resolved by running sfc /scannow. Here are my responses to each item:

Settings shows Adobe Acrobat is my default for .pdf files.

Although most of my working files are stored in OneDrive, they are also kept on my PC. I have copied PDF files to my backup G drive which is not linked to OneDrive. The same thing happens on the G drive.

I used Task Manager to Restart Windows Explorer. That did not resolve the problem. I have also restarted my PC for other reasons since I submitted my comment, and the problem continued.

I reassingned the .pdf default to Firefox. They opened on Firefox, but this did not resolve the issue. I restored their default to Adobe Acrobat.

The Preview Pane is enabled. I disabled it, closed and reopened Explorer, then enabled the Preview Pane. This did not resolve the issue.

I ran PowerShell as an Administrator to run sfc /scannow then restarted my PC.

  PS C: sfc /scannow

Beginning system scan. This process will take some time.

  Beginning verification phase of system scan.

  Verification 100% complete.

  Windows Resource Protection found corrupt files and successfully repaired them.

  For online repairs, details are included in the CBS log file located at

windir\Logs\CBS\CBS.10g. For example C: For offline

repairs, details are included in the log file provided by the /OFFLOGFILE flag.

I Restarted my PC.

Aha and Voila! This appears to have resolved the issue. I can view .pdf files in Windows Explorer from my OneDrive folder (the files are stored on my PC) or any other folder or drive.

Many thanks!
Emma1-N 13,150 Reputation points Microsoft External Staff Moderator

2026-06-24T07:40:00.5633333+00:00

Hello Ken Gosse,

Thank you for your sharing detail. If you still have any questions, please let me know, I will be here to assist you.
Ken Gosse 20 Reputation points

2026-06-25T17:08:35.1233333+00:00
The problem returned the next day.

PDF files in various folders are still disappearing from the file preview. This happens whether or not they had the option to Unblock them in the Properties General Tab. I always Unblock them if I get the prompt to do so.

I ran sfc /scannow then restarted my PC:

Windows PowerShell 5.1 PS C: sfc /scannow Beginning system scan. This process will take some time. Beginning verification phase of system scan. Verification 100% complete, Windows Resource Protection did not find any integrity violations.

This did not resolve the issue. I checked out PDF files from various folders, many of which I had been able to view in the past. My review included files that were old, files which I just Unblocked, and PDF files I converted from Word docs that I had created on my PC, so they had not been downloaded.
Ken Gosse 20 Reputation points

2026-06-25T17:38:59.94+00:00

After posting my reply stating the problem had returned, it seemed to have been resolved again. I had not repeated any steps suggested to resolve it. I used the Everything app to display all PDF files on my PC. I sorted from the oldest (2010) then opened several folders. Each PDF stayed displayed in the Preview. I sorted them by the latest and opened several folders. Each PDF stayed displayed in the Preview.

Then I rebooted (not restarted).

The issue returned for every PDF file I previously reviewed. If I Unblocked a file, it would appear then disappear. No other file types disappear from the Preview pane.
Ken Gosse 20 Reputation points

2026-06-25T22:43:17.51+00:00

Please disregard this. I posted it as a Comment rather than a reply. I just converted it, so this entry is now a duplicate.

The problem returned the next day...
Ken Gosse 20 Reputation points

2026-06-25T22:44:42.8233333+00:00

After posting my reply stating the problem had returned, it seemed to have been resolved again. I had not repeated any steps suggested to resolve it. I used the Everything app to display all PDF files on my PC. I sorted from the oldest (2010) then opened several folders. Each PDF stayed displayed in the Preview. I sorted them by the latest and opened several folders. Each PDF stayed displayed in the Preview.

Then I rebooted (not restarted).

The issue returned for every PDF file I previously reviewed. If I Unblocked a file, it would appear then disappear. No other file types disappear from the Preview pane.

1 additional answer

Your answer

Ken Gosse 20 Reputation points

2026-06-23T05:12:05.3033333+00:00

The issue appears to have been resolved by running sfc /scannow. Here are my responses to each item:

Settings shows Adobe Acrobat is my default for .pdf files.

Although most of my working files are stored in OneDrive, they are also kept on my PC. I have copied PDF files to my backup G drive which is not linked to OneDrive. The same thing happens on the G drive.

I used Task Manager to Restart Windows Explorer. That did not resolve the problem. I have also restarted my PC for other reasons since I submitted my comment, and the problem continued.

I reassingned the .pdf default to Firefox. They opened on Firefox, but this did not resolve the issue. I restored their default to Adobe Acrobat.

The Preview Pane is enabled. I disabled it, closed and reopened Explorer, then enabled the Preview Pane. This did not resolve the issue.

I ran PowerShell as an Administrator to run sfc /scannow then restarted my PC.

PS C: sfc /scannow

Beginning system scan. This process will take some time.

Beginning verification phase of system scan.

Verification 100% complete.

Windows Resource Protection found corrupt files and successfully repaired them.

For online repairs, details are included in the CBS log file located at

windir\Logs\CBS\CBS.10g. For example C: For offline

repairs, details are included in the log file provided by the /OFFLOGFILE flag.

I Restarted my PC.

Aha and Voila! This appears to have resolved the issue. I can view .pdf files in Windows Explorer from my OneDrive folder (the files are stored on my PC) or any other folder or drive.

Many thanks!
Emma1-N 13,150 Reputation points Microsoft External Staff Moderator

2026-06-24T07:40:00.5633333+00:00

Hello Ken Gosse,

Thank you for your sharing detail. If you still have any questions, please let me know, I will be here to assist you.
Ken Gosse 20 Reputation points

2026-06-25T17:08:35.1233333+00:00

The problem returned the next day.

PDF files in various folders are still disappearing from the file preview. This happens whether or not they had the option to Unblock them in the Properties General Tab. I always Unblock them if I get the prompt to do so.

I ran sfc /scannow then restarted my PC:

Windows PowerShell 5.1 PS C: sfc /scannow Beginning system scan. This process will take some time. Beginning verification phase of system scan. Verification 100% complete, Windows Resource Protection did not find any integrity violations.

This did not resolve the issue. I checked out PDF files from various folders, many of which I had been able to view in the past. My review included files that were old, files which I just Unblocked, and PDF files I converted from Word docs that I had created on my PC, so they had not been downloaded.
Ken Gosse 20 Reputation points

2026-06-25T17:38:59.94+00:00

After posting my reply stating the problem had returned, it seemed to have been resolved again. I had not repeated any steps suggested to resolve it. I used the Everything app to display all PDF files on my PC. I sorted from the oldest (2010) then opened several folders. Each PDF stayed displayed in the Preview. I sorted them by the latest and opened several folders. Each PDF stayed displayed in the Preview.

Then I rebooted (not restarted).

The issue returned for every PDF file I previously reviewed. If I Unblocked a file, it would appear then disappear. No other file types disappear from the Preview pane.
Ken Gosse 20 Reputation points

2026-06-25T22:43:17.51+00:00

Please disregard this. I posted it as a Comment rather than a reply. I just converted it, so this entry is now a duplicate.

The problem returned the next day...
Ken Gosse 20 Reputation points

2026-06-25T22:44:42.8233333+00:00

After posting my reply stating the problem had returned, it seemed to have been resolved again. I had not repeated any steps suggested to resolve it. I used the Everything app to display all PDF files on my PC. I sorted from the oldest (2010) then opened several folders. Each PDF stayed displayed in the Preview. I sorted them by the latest and opened several folders. Each PDF stayed displayed in the Preview.

Then I rebooted (not restarted).

The issue returned for every PDF file I previously reviewed. If I Unblocked a file, it would appear then disappear. No other file types disappear from the Preview pane.

Answer 1

I believe I found a fix.

I decided to use Google to search again: “Windows 11 PDF files disappear in explorer window”

Five suggestions were offered (Emma1-N already provided several of them, thank you). I tried #4:

Adjust PowerToys Add-ons

If you have Microsoft PowerToys installed, its built-in preview handlers often conflict with Adobe's PDF previewer.

Open the PowerToys app.

Navigate to File Management > File Explorer Add-ons.

Toggle off Enable PDF (.pdf) preview.

I opened File Management > File Explorer Add-ons. At the top, it says:

“Select the file types which must be rendered in the Preview Pane. Ensure that Preview Pane is open by toggling the view with Alt + P in File Explorer.

[!] Enabling the preview handlers will override other preview handlers already installed - there have been reports of incompatibility between Outlook and the PDF Preview Handler.

I toggled off “Enable PDF (.pdf) preview.”

My PDF files now display in Windows Explorer without disappearing. This includes files which required Unblocking. As a further test, I shut down and restarted my PC. The files still display as expected.

Emma1-N 13,150 Reputation points Microsoft External Staff Moderator

2026-06-27T06:19:48.4666667+00:00

Hello Ken Gosse,

I truly appreciate your feedback. I'm glad the solution worked for you, and I hope it will be helpful to others experiencing similar problems as well.