Windows preview pane stopped working with 10/15/2025 update -preview could harm computer

fleming 245

Essentially, opening files takes a long time and the preview page allowed to me to check files without opening them, for moving files to/from an appraisal workfile etc. Windows update just broke this. The error message I get is "The file you are attempting to preview could harm your computer. If you trust the file and the source you received it from, open it to view its contents". This pattern is common, Windows update routinely introduces user devastating bugs and efficiency downgrades, and I wish I could permanently remove Windows update functionality from my computer. Is there a fix for this windows preview bug on the horizon?

Katty A. Solórzano 35 Reputation points

2025-10-16T00:21:35.17+00:00

Certainly annoying. I'm going to uninstall this update. I hope they fix this mistake; it's time-consuming.
Ck 15 Reputation points

2025-10-19T00:10:50.3433333+00:00

if you see this update in your windows

2025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835)

try this one if none of the above works done this twice and confirm this update mess with preview pane especially pdf or doc files now my preview pane is fine and i set pause update to 5 weeks keeping this update uninstalled in my pc
Peter Bardland 5 Reputation points

2025-10-19T13:14:34.2766667+00:00

I had to make a temporary solution and it worked because I'm stuck in Windows 11 Insider Preview and the updates are integrated so you can't uninstall anything - I'll have to reinstall the entire computer after I get the spare computer.
https://www.howtogeek.com/this-is-the-ultimate-file-explorer-replacement-for-windows-11/
Tin Burina 40 Reputation points

2025-10-22T07:53:24.22+00:00

win+r - "inetcpl.cpl"- security - trusted sites - sites
tatsu ikeda 5 Reputation points

2025-10-22T20:06:03.0733333+00:00
Hi. I made a powerscript file to fix this. It will unblock any PDF's on your Desktop, Documents, or Downloads folders or you can do C: and D: drives. Plus it will unlock future PDF's that you download. Just copy past this into a file, say, fix-pdf-preview.ps1, save it. Then open a administrator PowerShell. navigate to where you saved it and then run .\fix-pdf-preview.ps1. It will give you various options. You are welcome!

=========================================================

Fix Windows 11 PDF Preview Issue (KB5066835)

=========================================================

This script fixes the "file you are attempting to preview

could harm your computer" error in Windows File Explorer

Caused by: October 2025 Windows Update KB5066835

=========================================================

Write-Host "=====================================================" -ForegroundColor Cyan

Write-Host " Windows 11 PDF Preview Fix Script" -ForegroundColor Cyan

Write-Host "=====================================================" -ForegroundColor Cyan

Write-Host ""

Check if running as Administrator

$isAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)

if (-not $isAdmin) {

Write-Host "ERROR: This script must be run as Administrator!" -ForegroundColor Red Write-Host "Right-click on PowerShell and select 'Run as Administrator'" -ForegroundColor Yellow Write-Host "" Read-Host "Press Enter to exit" exit

}

Write-Host "Running as Administrator - OK" -ForegroundColor Green

Write-Host ""

=========================================================

STEP 1: Prevent future files from being blocked

=========================================================

Write-Host "[STEP 1] Configuring registry to prevent future file blocking..." -ForegroundColor Yellow

try {

# Create the registry key if it doesn't exist $regPath = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments" if (-not (Test-Path $regPath)) { New-Item -Path $regPath -Force | Out-Null Write-Host " - Created registry key" -ForegroundColor Green } # Set the SaveZoneInformation value New-ItemProperty -Path $regPath -Name "SaveZoneInformation" -PropertyType DWord -Value 1 -Force | Out-Null Write-Host " - Set SaveZoneInformation = 1" -ForegroundColor Green Write-Host " - Future downloads will no longer be blocked!" -ForegroundColor Green

} catch {

Write-Host " - ERROR: Failed to modify registry" -ForegroundColor Red Write-Host " - $($_.Exception.Message)" -ForegroundColor Red

}

Write-Host ""

=========================================================

STEP 2: Unblock existing files

=========================================================

Write-Host "[STEP 2] Choose which files to unblock:" -ForegroundColor Yellow

Write-Host ""

Write-Host " 1. Downloads folder only (Quick - Recommended)" -ForegroundColor White

Write-Host " 2. Documents folder only" -ForegroundColor White

Write-Host " 3. Desktop folder only" -ForegroundColor White

Write-Host " 4. All three folders (Downloads, Documents, Desktop)" -ForegroundColor White

Write-Host " 5. Entire C: drive (Slow - may take several minutes)" -ForegroundColor White

Write-Host " 6. Entire D: drive (Slow - may take several minutes)" -ForegroundColor White

Write-Host " 7. Both C: and D: drives (Very slow - may take 10+ minutes)" -ForegroundColor White

Write-Host " 8. Custom folder path" -ForegroundColor White

Write-Host " 9. Skip this step" -ForegroundColor White

Write-Host ""

$choice = Read-Host "Enter your choice (1-9)"

$foldersToUnblock = @()

switch ($choice) {

"1" { $foldersToUnblock += "$env:USERPROFILE\Downloads" } "2" { $foldersToUnblock += "$env:USERPROFILE\Documents" } "3" { $foldersToUnblock += "$env:USERPROFILE\Desktop" } "4" { $foldersToUnblock += "$env:USERPROFILE\Downloads" $foldersToUnblock += "$env:USERPROFILE\Documents" $foldersToUnblock += "$env:USERPROFILE\Desktop" } "5" { $foldersToUnblock += "C:\" } "6" { if (Test-Path "D:\") { $foldersToUnblock += "D:\" } else { Write-Host " - ERROR: D: drive not found" -ForegroundColor Red } } "7" { $foldersToUnblock += "C:\" if (Test-Path "D:\") { $foldersToUnblock += "D:\" } else { Write-Host " - WARNING: D: drive not found, will only scan C:" -ForegroundColor Yellow } } "8" { $customPath = Read-Host "Enter the full path to the folder (e.g., D:\MyFolder)" if (Test-Path $customPath) { $foldersToUnblock += $customPath } else { Write-Host " - ERROR: Path not found: $customPath" -ForegroundColor Red } } "9" { Write-Host " - Skipping file unblocking" -ForegroundColor Yellow } default { Write-Host " - Invalid choice. Skipping file unblocking." -ForegroundColor Red }

}

Write-Host ""

foreach ($folder in $foldersToUnblock) {

Write-Host " - Unblocking files in: $folder" -ForegroundColor Cyan try { $files = Get-ChildItem -Path $folder -Recurse -ErrorAction SilentlyContinue $totalFiles = $files.Count $unblocked = 0 Write-Host " Found $totalFiles files to check..." -ForegroundColor White foreach ($file in $files) { try { Unblock-File -Path $file.FullName -ErrorAction SilentlyContinue $unblocked++ } catch { # Silently continue on errors (files in use, permission issues, etc.) } } Write-Host " Processed $unblocked files successfully!" -ForegroundColor Green } catch { Write-Host " ERROR: $($_.Exception.Message)" -ForegroundColor Red }

}

=========================================================

STEP 3: Restart File Explorer

=========================================================

Write-Host ""

Write-Host "[STEP 3] Restart Windows Explorer to apply changes?" -ForegroundColor Yellow

$restart = Read-Host "Restart Explorer now? (Y/N)"

if ($restart -eq "Y" -or $restart -eq "y") {

Write-Host " - Restarting Windows Explorer..." -ForegroundColor Cyan Stop-Process -Name explorer -Force Start-Sleep -Seconds 2 Start-Process explorer Write-Host " - Windows Explorer restarted!" -ForegroundColor Green

} else {

Write-Host " - Skipped. Please restart Explorer manually or reboot your PC." -ForegroundColor Yellow

}

=========================================================

COMPLETION

=========================================================

Write-Host ""

Write-Host "=====================================================" -ForegroundColor Cyan

Write-Host " Script completed!" -ForegroundColor Green

Write-Host "=====================================================" -ForegroundColor Cyan

Write-Host ""

Write-Host "What was done:" -ForegroundColor White

Write-Host " ✓ Registry updated to prevent future file blocking" -ForegroundColor Green

Write-Host " ✓ Existing files unblocked (if selected)" -ForegroundColor Green

Write-Host ""

Write-Host "If you still see the preview warning:" -ForegroundColor Yellow

Write-Host " 1. Restart your computer" -ForegroundColor White

Write-Host " 2. Or consider uninstalling update KB5066835:" -ForegroundColor White

Write-Host " Settings > Windows Update > Update History > Uninstall Updates" -ForegroundColor White

Write-Host ""

Read-Host "Press Enter to exit"
Willie 0 Reputation points

2025-10-22T20:23:32.66+00:00

I am having the same issue. Having to open each file if I just need a preview is a pain. As far as I am aware, it's only for Adobe files. I have not checked any other file type at this time.
SueLyn Cheang 0 Reputation points

2025-10-23T01:59:29.7+00:00

This annoyed me so much too!

Looks like it's because Windows started tagging files with a Zone.Identifier after the 15 October 2025 update (Yes, its intentional!) https://support.microsoft.com/en-us/topic/file-explorer-automatically-disables-the-preview-feature-for-files-downloaded-from-the-internet-56d55920-6187-4aae-a4f6-102454ef61fb

This solution worked for me - run a powershell script to batch unblock all your files. In powershell of the main folder, copy paste this:

Get-ChildItem -LiteralPath "." -Recurse -File -ErrorAction SilentlyContinue |

Where-Object { -not ($_.Attributes -band [IO.FileAttributes]::Offline) } |

Unblock-File -ErrorAction SilentlyContinue

Good luck!
HW 15 Reputation points

2025-10-23T20:56:12.73+00:00

This new update is horrible. We need the preview pane back. We use this daily to name files and now we cannot do that in an efficient manner.
robert b 10 Reputation points

2025-10-24T13:35:50.4566667+00:00

I dont even have words for how much I hate this feature. Makes me want to get an Apple.
qmp 5 Reputation points

2025-10-29T12:29:45.7733333+00:00

https://learn.microsoft.com/en-us/answers/questions/5601854/file-explorer-preview-pane-shows-the-file-you-are
Jim Strowe 11 Reputation points

2025-10-30T13:07:26.8266667+00:00

This was not a well considered update. They've taken very BASIC functionality and turned it off while requiring average users to turn it back on. IF the preview pane is dangerous then remove execution capability for previewing a file. If the preview panel IS a vector then remove the ability to run things in preview. (I did not think that preview could RUN anything so if it could I could see why it was shut OFF but still the wrong way to do this)

This was a poor decision on MS part. Unannounced except in trade channels most users will have zero idea what the heck happened. An average user will not understand why, how or what to do. As far as Joe User preview is now busted.
Kay 5 Reputation points

2025-10-30T14:51:15.5266667+00:00

Found a temp/possibly permanent solution through my company's IT:

Control Panel > Internet Properties > Security > Trusted sites > Sites > Add this website to the zone: file://users > Add

If you're on a server/network then instead of users , put the name of your network drive
Isabel Mackay 5 Reputation points

2025-10-31T12:33:16.1266667+00:00

Do you know how I do this for GDrive app through windows file explorer.....
Jj E 0 Reputation points

2025-11-13T14:49:22.8766667+00:00

WHAT A PAIN IN THE ARSEEEE
Mary Q Contrary 0 Reputation points

2025-11-15T22:28:54.45+00:00

It's a month after the original post, so I don't know if anyone will read my reply. I have the same problem as others. an October update took away my abillity to preview pdfs in windows file explorer. I can try to uninstall the october update, but in the meantime I have had one other update installed. Do I need to also uninstall it? Or will it operate correctly if I only uninstall the october update? By the way, I am on Windows 10 ESU. Extended use for a year. The October update for my Windows 10 is: October 14, 2025—KB5066791 (OS Builds 19044.6456 and 19045.6456). In the details for it it specifically says the ability to preview files downloaded from the internet has been removed. Which is horrible because my work involves being able to do that.
Mary Q Contrary 0 Reputation points

2025-12-10T20:30:10.4733333+00:00

I don't know if a real solution has been found yet. I stumbled upon a fix for me while having to bypass the use of the internet on a laptop I suspected of hacking issues. Yet I still had to use the laptop for work until another computer could be repaired. I had to send and receive pdfs due to my work. So I attached my cellphone to my laptop with a usb cord. On my cellphone (android) it would say, charging only, click the notification for more options. After click the notification I chose "transfer files". I accidentally found that pdfs I downloaded from email into my cellphone and then transferred into the windows laptop using windows file explorer (from my phone into whatever folder I wished on the laptop) COULD BE PREVIEWED IN FILE EXPLORER!!!

I tested this also by emailing myself some older downloaded pdfs which could not be previewed in file explorer. I downloaded them in my cellphone, then transferred them into the laptop.

I CAN PREVIEW THEM IN FILE EXPLORER!!!

If Microsoft finds out about this I am sure they will plug this hole. But in the meantime experiment with it to see if it helps you.

(A week ago after trying to uninstall the unwanted update. when it didn't fix the problem I tried system restore which truly killed my desktop computer. I have been using my extra laptop since then waiting on the return of the main computer, .)
Deleted

This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
ORubio-CAS 0 Reputation points

2026-02-04T13:26:08.0233333+00:00

Wondering what will happen sooner, a fix to this nonsense or a CLASS ACTION LAWUIT against MS for production time lost in the global business community.
B W 10 Reputation points

2026-02-08T23:02:22.9133333+00:00

So frustrated by this update. I can't find anything to fix it.

Everything I scan is hidden on preview pane now and to name the documents I scanned I have to open every single one and then close it and change it's name. If I save it's name while open then I'm left with the scanned doc still with the scanned name so I have the same amount of documents to go through and see if it is one that still needs named or deleted because it's the one I just named...

Dumbest update ever!!!

16 answers

Margie Wood 45 Reputation points

2026-01-28T01:41:58.6166667+00:00

This is BS. I am certaintly not writing scripts etc to fix this issue. Microsoft needs to get this update out asap so I can view my files in the explorer. I am willing to take the risk! This is crazy it is taking me forever to open up every file to view and/or changing properties to allow me to view it.
Was this answer helpful?

20+ people found this answer helpful.
Sandi Elmore 0 Reputation points

2026-02-18T21:31:38.0366667+00:00

One of the least effective updates I've seen. This does nothing for efficiency. I wish they'd stop 'fixing' things.

Mary Q Contrary 0 Reputation points

2026-02-18T22:20:14.9966667+00:00

If you have a way to connect your cellphone to your computer, like via an usb plug, select for the usb to transfer files, not just charge the cellphone; then download the attachment into your cellphone's download file. then go to file explorer on your pc. look for your cellphone. you should be able to click on it and see its internal storage and files. go to its download folder, find the files you just downloaded, then copy them to their destination on your pc. voila. they are viewable in file explorer. i have been doing this for several months now. on your cellphone go into your email program and download the files from there into your phone.

Gary Jackson 0 Reputation points

2026-04-03T17:35:43.17+00:00

I have found a work around that is a bit annoying but will allow you to preview files in a folder. In my case, text and word documents were showing in the preview pane but image files were not. To fix this, select all image files, or all files, right click and choose open. If you have just selected image files, they will open in the Photos app. Once opened, rapidly click through the images using the next arrow on the right side of the screen. Once you have clicked through them all, close the Photos app and the images will start appearing in your preview pane when you click on them. Unfortunately, you will have to repeat this for each folder until Microsoft publishes a fix for this issue.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Kirill P 55 Reputation points

2025-10-17T18:45:56.86+00:00
After applying this solution, Windows will stop showing the "security warning" when you try to open files downloaded to your Downloads folder.

Step 1: Unblock all already downloaded PDF files. Open PowerShell as Administrator and run:
```
Unblock-File -Path "C:\Users\admin\Downloads\*.pdf"
```
Replace admin with the actual path where your files are downloaded. Usually, it's your user folder on drive C. You can check your exact user path by running this command in PowerShell:
```
$home
```
Step 2: Prevent Windows from setting the "file is blocked" flag for newly downloaded files. Open Registry Editor (Win + R > type regedit) and navigate to:
```
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\
```
Create a new key named Attachments. Inside it, create a new DWORD (32-bit) value called SaveZoneInformation and set it to 1.

Or paste this in PowerShell:
```
New-Item -Path "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments" -Force | Out-Null
New-ItemProperty -Path "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments" -Name "SaveZoneInformation" -PropertyType DWord -Value 1 -Force | Out-Null
```
Alternatively, you can do the same via Group Policy Editor (Win + R > type gpedit.msc): User Configuration > Administrative Templates > Windows Components > Attachment Manager > Do not preserve zone information in file attachments > Enabled

Step 3: The same issue can happen when opening PDFs from shared network locations. In that case, do the following: Press Win + R, type inetcpl.cpl, and open the Security tab. Select Local intranet > click Sites > check Automatically detect intranet network. You can also click Advanced, then add the required network IP range manually — for example: 192.168.1.* > click Add.
Was this answer helpful?

9 people found this answer helpful.
Сергей Сергеев 0 Reputation points

2025-10-18T13:47:57.34+00:00

Everything works except downloads

Dkotes 10 Reputation points

2025-10-18T19:40:25.42+00:00

I'm also currently suffering from this problem and it is quite annoying. I have a large number of Scientific Journal Articles I need to organize based on their actual titles and other identifying information found in the preview, not found in their default file name.

Isabel Mackay 5 Reputation points

2025-10-23T08:51:37.2033333+00:00

This has worked for my downloads which solves a major problem, but do you have any advice for G Drive from Windows Explorer? Thank you.

Leigh Layton 5 Reputation points

2025-10-28T12:33:25.95+00:00

With the exception of Step 1 that addresses files already in the Downloads folder, none of these solutions have worked. This is so incredibly frustrating.

CassandraMadison-2290 0 Reputation points

2025-12-05T04:32:56.72+00:00

Thank you, this worked well for me.

MR 0 Reputation points

2026-01-23T14:42:42.2466667+00:00

Awesome instructions. Worked for me. Thank you.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Restee Miranda 14,095 Reputation points Independent Advisor

2025-10-15T15:06:06.2666667+00:00
Hi Fleming,

The October 15, 2025 Windows update introduced a new security feature that flags certain files in the preview pane with the message:

"The file you are attempting to preview could harm your computer. If you trust the file and the source you received it from, open it to view its contents."

This has disrupted workflows for many users who rely on the preview pane to quickly inspect files without opening them.

It's likely tied to tightened security policies around file previews. Since it's related to new protections against potentially malicious files, especially those downloaded from the internet or shared via network drives.

There’s no confirmed fix yet, but here are a few things you can try:
1. Unblock the file manually:
Right-click the file, go to Properties, and if you see an "Unblock" checkbox at the bottom, check it and click Apply. This tells Windows you trust the file.
1. Check Group Policy settings:
If you're on Windows Pro or Enterprise, open the Group Policy Editor (gpedit.msc) and navigate to:

User Configuration > Administrative Templates > Windows Components > File Explorer

Look for settings related to "Do not allow previewing attachments" or similar and adjust accordingly.
1. Roll back the update (temporary fix):
If this issue is severely impacting your work, you can uninstall the October update via:

Settings > Windows Update > Update History > Uninstall Updates

Look for the update installed on or around October 15, 2025 (likely KB5066835 or KB5066793).
1. Use third-party preview tools:
Apps like QuickLook or PowerToys (with preview handlers) can offer similar preview functionality outside of File Explorer. Just be aware that PowerToys may also be affected depending on the file type and system configuration.

With this, you can help by submitting feedback via the Feedback Hub app in Windows.
Was this answer helpful?

6 people found this answer helpful.
ANFAS RAWSDEEN 0 Reputation points

2025-10-16T10:39:20.09+00:00

then how to preview word file

Gajanan Narwade 10 Reputation points

2025-10-16T10:54:51.76+00:00

Uninstalling updates of 15 oct 2025, has resolve my preview pan issue.

Peter Chambers 5 Reputation points

2025-10-16T12:12:41.3166667+00:00

Option 1 'Manually unblock' is a good call (Properties / General tab / Security / tick Unblock), but I had to re-start Windows for the change to take effect. Many thanks!
Update: just moving the file to a different directory seems to push Explorer into acknowledging the Unblock - then no need to restart Explorer. But you have to do case-by-case, i.e. file-by-file grrgrgrgrgr!

Bobby Yao 30 Reputation points

2025-10-16T22:19:13.9133333+00:00

Same issue here after running 10/15/25 update. getting same message on 99% of the files, Word, PDF, Excel, etc. Tried uninstalling/rolling back the update and ran into another error. 0x800f0825... 10/16/25 - emailed MS support regarding update uninstall error... and MS support basically went Goodfellas on me.. F U pay me. I have to now choose to pay for a support plan.

funny how this is coming up right as they end Win10 support. Unreal!

Neil H 20 Reputation points

2025-10-17T10:14:55.4933333+00:00

why tell people to use the Group Policy Editor to change a setting like: "Do not allow previewing attachments" or similar... when there is no such setting in it??

Wasting more of users time trying to sort out a problem that should be asked of users before its even implemented into windows

Dkotes 10 Reputation points

2025-10-18T19:39:19.0633333+00:00

How do you uninstall specific updates?

Kong Tuck Chee 6 Reputation points

2025-10-21T04:27:12.1166667+00:00

under control panel, program and features, view installed updates

Cynthia Lewis 25 Reputation points

2025-10-21T05:20:15.7033333+00:00

Just another reason why we loathe Microsoft...

Katty A. Solórzano 35 Reputation points

2025-10-24T00:15:58.37+00:00

Uninstalling Oct 15 2025 update by system restoring from an old restoration point was the answer for me. I am really glad this happened because it strengthened my resolve to learn Linux and make the switch. I do hate Linux, but the unconsulted updates chaos has been costing me productivity money through the years. I have been a Windows too loyal user since 7 1/2 floppy disks.

Fleming Schutrumpf 5 Reputation points

2025-10-24T13:01:47.1666667+00:00

One poster suggested using a 3rd party app instead of broken Windows explorer but I cannot preview files before attaching them. Essentially, WINDOWS 11 is NOW BROKEN and officially unusable. The VP in charge of this division needs to be replaced with someone who knows how to fix broken development organizations and institute a quality culture to replace the "users will suffer whatever garbage we non-consensually update their devices with as we regularly do".

Fleming Schutrumpf 5 Reputation points

2025-10-24T13:05:33.8433333+00:00

I just opened 300 files that I needed to attach and email to proof them since preview pane is broken. That crashed my computer too. Windows11 is just no longer capable of supporting desktop business computing. Oh, but it was a failed, cancelled OS for a little gaming tablet that cancelled. Maybe it was never meant to support business usage.

Redd, Scott 0 Reputation points

2025-10-30T16:27:55.4033333+00:00

I Uninstalled 2025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) for a user. That resolved the preview issue with File Explorer for them.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
poiu qwerty 20 Reputation points

2025-10-21T21:23:02.3333333+00:00

I uninstalled the recent update KB5066835 and the preview pane now works.

Hope this helps
Was this answer helpful?

4 people found this answer helpful.
Mark Lynch 5 Reputation points

2025-10-30T09:36:56.2066667+00:00

Yes this worked for me, thanks. A bit silly that an update actually messes up a standard system function...

Cynthia Lewis 25 Reputation points

2025-10-30T10:06:45.5133333+00:00

Problem is as soon as I uninstall, that nigh Windows frikkin reinstalls it!

poiu qwerty 20 Reputation points

2025-10-30T10:33:49.8166667+00:00

I have paused the updates for 6 weeks in hope Microsoft sends a update fix

Fleming Schutrumpf 5 Reputation points

2025-12-10T18:42:56.1566667+00:00

I was able to uninstall it for a while, but MS wants to keep reinstalling this bug-update, and now after uninstalling 4 times, it doesn't let me uninstall it anymore. I get an uninstall failed error message....
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Dave mettetal 15 Reputation points

2025-10-23T15:26:29.9533333+00:00

This fix only works on a per folder basis. If you are working with multiple folders on a given drive is there a way to input a global fix for all folders?

:

Unblock-File -Path "C:\Users\admin\Downloads*.pdf"
Was this answer helpful?

3 people found this answer helpful.
Alexis Barnett 5 Reputation points

2025-11-21T00:29:15.32+00:00

and why is it blocking files downloaded from trusted sender emails!
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Windows preview pane stopped working with 10/15/2025 update -preview could harm computer

=========================================================

Fix Windows 11 PDF Preview Issue (KB5066835)

=========================================================

This script fixes the "file you are attempting to preview

could harm your computer" error in Windows File Explorer

Caused by: October 2025 Windows Update KB5066835

=========================================================

Check if running as Administrator

=========================================================

STEP 1: Prevent future files from being blocked

=========================================================

=========================================================

STEP 2: Unblock existing files

=========================================================

=========================================================

STEP 3: Restart File Explorer

=========================================================

=========================================================

COMPLETION

=========================================================

16 answers

Your answer