On Windows 10 you can make SumatraPDF to be a default viewer for all supported document types.
In that case double-clicking on a file in Explorer will open SumatraPDF to view the document.
Here's how to make SumatraPDF a default PDF viewer:
In Explorer:
  • find a PDF file
  • 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":
You can do the same for other file types supported by SumatraPDF.

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