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×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
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×InformationNeed Windows 11 help?Check documents on compatibility, FAQs, upgrade information and available fixes.
Windows 11 Support Center. -

Create an account on the HP Community to personalize your profile and ask a question
05-15-2022 11:45 AM
Welcome to the HP User Community.
The source of the problem might be the PDF reader in your web browser.
For example, most browsers include a built-in PDF reader -
The built-in PDF reader in the browser might not be able to understand the file format
Conversely
If you have added any "PDF reader" extension, that extension might be having trouble opening the file in the email.
Note
To some extent, the following is also relevant if you are trying to open a PDF file from within an installed mail client (for example Outlook or Thunderbird). Windows Mail does not generally include its own PDF reader and would be relying on your installed PDF software (for example, Adobe Reader DC ).
If you have not done so,
Consider / Try
Download and Save that "cannot open" PDF file.
Open File Explorer
Navigate to the folder where you saved the file (likely Downloads)
Open the PDF file with Adobe Reader DC
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Reinstall / Update your PDF Reader (Adobe Reader DC /Optional Foxit Reader)
- HINT: Watch out for and UNCHECK unwanted extra software
- Adobe Reader DC software should be installed even if you do not open / view / print PDF files directly from the software.
Reference
Adobe Acrobat Reader Learn & Support
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