PDFs not opening in emails

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EECITMANAGER
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Joined: Thu May 21, 2026 6:45 pm

PDFs not opening in emails

Post by EECITMANAGER »

After the latest update, we have multiple users that are not able to open PDFs from their email. Before going down a rabbit hole, does any else have this same issue and have they came up with a resolution?
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Daniel - PDF-XChange
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Re: PDFs not opening in emails

Post by Daniel - PDF-XChange »

Hello, EECITMANAGER

There are some known issues with Outlook specifically, which we are already developing fixes for.

If the issue extends not only to the mail client, but is system wide, you may need to manually change the windows "default apps" menu option for PDF files - and then restart the PC for it to take effect.

Kind regards,
Dan McIntyre - Support Technician
PDF-XChange Co. LTD

+++++++++++++++++++++++++++++++++++
Our Web site domain and email address has changed as of 26/10/2023.
https://www.pdf-xchange.com
[email protected]
sc_bueschel
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Joined: Wed Jun 17, 2026 12:28 pm

Re: PDFs not opening in emails

Post by sc_bueschel »

Hey, we’re having the same issue here: PDFs from Outlook suddenly don’t open anymore with PDF-XChange Editor. Seems to be exactly what’s described in this thread. In classic Outlook nothing happens when trying to open them, and in the new Outlook it actually throws an error. We already tried changing default apps and did a full reinstall of PDF-XChange, but no luck. We’ve got around 300 users and are getting quite a lot of tickets about this right now. The only workaround so far is saving the attachment manually and opening it afterwards, which is pretty annoying. Did anyone find a fix or a better workaround for this?
Stephan10
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Joined: Wed Jun 17, 2026 11:55 am

Re: PDFs not opening in emails

Post by Stephan10 »

Hello,

I have the same problem. After the update, I can no longer open PDFs in Outlook, although the preview works.

PDF-XChange is set as the default, and my IT department can't help either.
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Dimitar - PDF-XChange
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Re: PDFs not opening in emails

Post by Dimitar - PDF-XChange »

Hi,

Please take a look at this article:

https://www.pdf-xchange.com/knowledgeba ... t-Defender

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EECITMANAGER
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Re: PDFs not opening in emails

Post by EECITMANAGER »

Daniel - PDF-XChange wrote: Tue Jun 16, 2026 9:12 pm Hello, EECITMANAGER

There are some known issues with Outlook specifically, which we are already developing fixes for.

If the issue extends not only to the mail client, but is system wide, you may need to manually change the windows "default apps" menu option for PDF files - and then restart the PC for it to take effect.

Kind regards,
Do you have a time frame on this resolution? We have went and manually set the windows default app and this does not help. There was a post below about Windows defeneder being the root of the issue, does PDF Xchange have any input on this?
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Daniel - PDF-XChange
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Re: PDFs not opening in emails

Post by Daniel - PDF-XChange »

Hello, EECITMANAGER

Unfortunately no... Our hands are tied and we are stuck waiting on Microsoft to resolve the error on their end.. Once the Ms Defender issues are resolved, this should work once again.

Kind regards,
Dan McIntyre - Support Technician
PDF-XChange Co. LTD

+++++++++++++++++++++++++++++++++++
Our Web site domain and email address has changed as of 26/10/2023.
https://www.pdf-xchange.com
[email protected]