How to Make Icecream PDF Editor your Default PDF Reader
"Choose another app"
In your File Explorer or on your Desktop, right click on any PDF document. Select "Open With", select "choose another app" to open the "How do you want to open this file?" popup with the list of options.
Select Icecream PDF Editor
Select Icecream PDF Editor from the list. Don't forget to check the option "Always use this app to open .PDF files".
Press "OK" to apply the change
Congratulations! Now Icecream PDF Editor is your default app for viewing/editing PDF documents.
Please notice: If Icecream PDF Editor doesn't appear in "How do you want to open this file?" box, you should scroll down to find "More apps" option. Click it to browse Icecream PDF Editor. If no luck still, scroll down even more to see "Look for another app in this PC" option. Click it to find Icecream PDF Editor, then click "Open" button to set it as the default app.