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Set as default PDF viewer
If there are no other applications registered for a given extension,
you can open the file in SumatraPDF simply by double-clicking the file
in File Explorer.
If there is more than one application, you have to explicitly tell
Windows 10 to make SumatraPDF default application.
Using File Explorer
In File Explorer:
- find a .pdf file (or any other supported file type)
- right-click to get a context menu
- select
Open with
and then
Choose another app
From the list, choose SumatraPDF
and check
Always use this app to open .pdf files
:
Using Default apps system settings
This is based on latest Windows 11 build at the time of this writing.
Unfortunately the details differ between Windows updates.
Launch Default app
section in settings app, e.g. use
Windows logo
hot-key to launch system-wide search, type
default apps
and click on Default apps
search
result to launch settings app.
In Default apps type .pdf
for file extension:
Click on current default PDF application (Microsoft Edge
in this example) and select SumatraPDF
:
You can do that for other file formats.