Why does Outlook Not Open Picture Attachments?
Outlook copies every attachment to a hidden temporary folder before it opens the file. A full or damaged folder, a broken file association, a blocking add-in or an antivirus rule can stop that step.
| Cause | Fix |
|---|---|
| Add-in conflict | Use safe mode |
| Full Secure Temp folder | Clear the folder |
| Wrong default photo app | Reset the file association |
| Antivirus or file block | Check the alert and the exclusions |
How do You Rule Out Add-Ins?
Method #1: Start Outlook in Safe Mode (Free)
Who it suits. Users whose attachments fail after an add-in install. Extra application. None.
- Close Outlook.
- Press Windows key + R, type outlook.exe /safe and select OK.
- Open the picture attachment.
- If it opens, disable add-ins one by one under File, Options and Add-ins.
How do You Clear the Secure Temp Folder?
Method #2: Clear the Outlook Secure Temp Folder (Free)
Who it suits. Anyone who sees an error that says Outlook cannot create the file. Extra application. Registry Editor.
Outlook MVP guidance explains that Outlook stores opened attachments in this folder and that cleaning it solves many open errors. The OutlookSecureTempFolder value under the Outlook Security registry key holds the path.
- Close Outlook.
- Open Registry Editor and go to the Outlook Security key for your Office version.
- Copy the path from the OutlookSecureTempFolder value.
- Paste the path in File Explorer and delete the files inside.
- Start Outlook and open the picture again.
Heads Up. Edit the registry only with care. Export the key first, because a wrong edit can break Windows or Office.
What About the Default Photo App?
Method #3: Reset the Default App (Free)
Who it suits. Users who see an image previewer error. Extra application. None.
Save the picture to your desktop and open it. If it fails there too, right click the file, select Open with and choose your photo app as the default for that file type. Outlook uses the same association.
Microsoft states that Outlook blocks some unsafe file types and shows an alert on the message. Read the alert before you edit settings.
What if the Fixes Fail?
Method #4: Extract the Images (Paid After Demo)
Who it suits. Anyone who needs the pictures out of the mailbox now. Extra application. Outlook Attachment Extractor.
The Outlook Attachment Extractor pulls attachments and inline images from PST, OST, OLM, OLK and MSG files. It filters by date and sets naming options. It reads the files directly, so a broken Outlook preview does not matter.
See our guides to save all attachments in Outlook to a folder and save embedded images from Outlook emails.
Frequently Asked Questions
Why does Outlook Not Open JPG Attachments?
A full Secure Temp folder, an add-in conflict, a broken file association or an antivirus rule is the usual cause.
How do You Open Safe Mode?
Press Windows key + R, type outlook.exe /safe and select OK.
Where does Outlook Store Opened Attachments?
In a hidden Secure Temp folder. The OutlookSecureTempFolder registry value holds the path.
Does Outlook Block Picture Files?
Microsoft states that Outlook blocks some unsafe file types and shows an alert on the message.
Do Mac and Windows Differ?
Yes. The steps here apply to Outlook for Windows.
Can You Get the Pictures Without Opening Them in Outlook?
Yes. An extractor reads PST and OST files and saves the pictures to a folder.
Does Clearing the Temp Folder Delete Emails?
No. It deletes only the temporary copies of opened attachments.
Author's Verdict
Test safe mode first and clear the Secure Temp folder second, because those two fix most cases.
Use an extractor when you need the pictures at once.
Key Takeaways
- Outlook copies attachments to a temp folder before it opens them.
- Safe mode shows if an add-in causes the error.
- An extractor skips the Outlook preview.
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