I am using microsoft Lumia 640 xl and windows 10. I am facing a problem from Microsoft edge. Every time i open a pdf file edge ( system app) automatically opens and in case of heavy books it crashes many times even when i have onereader already installed on my mobile. So how to stop edge to open pdf every time. I tried to find the solution in forum also but failed. So how to get rid of edge.
Microsoft Edge is set to open PDF files by default. You cannot change that Windows 10 Mobile. If you want to use your dedicated PDF viewer app then you must open PDF file through that app.
In Windows 10, including Windows 10 Mobile, Microsoft Edge is the default
Only for expert users there is the possibility of changing a registry key. It changes also the file icon in explorer. I can write details if it is of interest for someone. I have done the change on my Lumia 640XL. You can use Interop Tools to edit the registry. This is the main place to find it and learn about it: https://forum.xda-developers.com/windows-10-mobile/windows-10-mobile-apps-and-games/app-interop-tools-versatile-registry-t3445271
Please, always remember that change registry keys could not be safe.
The registry keys of file associations are here:
The default content of .pdf key is:
For example if you use Acrobat Reader the string is: