MS Edge is a standard PDF viewer on Windows 10, but when attempting to launch the specific PDF file or invoke the internet URL on MS Edge web browser, it failed to do it for some reason. So, if you want to fix this issue, then follow this blog.

 

Reset Microsoft Edge as Default PDF Viewer to Open PDF Files on MS Edge

 

If you want to reset the MS Edge as default PDF viewer, carry out the steps in the same way as explained below:

 
  1. Hold the Win and I keys altogether over the keyboard to invoke the Windows settings.

  2. After that, select the Apps option, then choose the Default apps option.

  3. You should choose the ‘Choose default apps by file type’ link:

  4. Then move down until you locate the ‘PDF’ entry, then choose the Edge beside it.

  5. Afterward, choose any PDF viewer on the list and change it to default PDF viewer temporarily.

  6. Later, reset the Edge as a standard viewer and shut Settings.

  7. To perform the modifications, it is advisable to restart the system.

Fix MS Edge Issues to Open PDF Files on MS Edge

 

If you want to solve the MS Edge issue, carry out the steps in the same way as explained below:

 
  1. Hold the Win and I buttons altogether over the keyboard to invoke the settings.

  2. After that, choose the Apps option and launch the section of ‘Apps & Features.’

  3. Then find and choose the entry of Microsoft Edge.

  4. You should locate the Advanced options link and launch the ‘Storage usage and app reset screen.’

  5. You can view the options of ‘Repair’ and ‘Reset.’

  6. Select the Repair button.

  7. To verify the option, choose the button of Repair and shut the settings.

  8. Now, reboot the MS Edge and check whether the issue has been fixed.

Remove Cache to Open PDF Files on MS Edge

 

If you want to remove the cache in MS Edge, carry out the steps in the same way as explained below:

 
  1. You have to invoke the browser on your system.

  2. After that, select the ‘Settings and more’ option.

  3. Then locate the Settings option to move to ‘Privacy and services’ beneath the ‘Clear browsing data’ section.

  4. You should select the ‘Choose what to clear’ option.

  5. Now, click on the ‘Cached images and files’ then choose the ‘Clear now’ option.

Turn off the Protected Mode at Startup to Open PDF Files on MS Edge

 

If you want to disable the protected mode at startup, carry out the steps in the same way as explained below:

 
  1. You should launch Adobe Reader on your system.

  2. After that, select the button of Edit on the upper left side of the screen.

  3. Then move down to the menu of Edit until you reach the Preferences option and select it.

  4. You will view a new window on your system with several categories.

  5. Later, choose the ‘Security enhances’ option by selecting it.

  6. Beneath the ‘Sandbox protections’ option, turn off the ‘Protected mode at startup’ by unchecking the box.

  7. Now, most users complain that they have solved the problem by executing this process.

Source :- https://softwareinformation1.wordpress.com/2021/11/23/heres-why-pdf-files-not-open-on-microsoft-edge/