Comment 4 for bug 1654461

A recurring issue? Some related earlier reports (there might be others):
Bug #1360906 “Inkscape does not register the *.svg file extension”
Bug #1399720 “91 pre msi breaks Chrome SVG render”
Bug #1417146 “0.91, 64-bit unable to associate SVG with Inkscape in Win7, 64-bit”

Bug #1360906 was filed by the same reporter, and at the time confirmed fixed for Inkscape 0.91 by the reporter.

Similarly for PDF:
Bug #1417055 “Inkscape not set as PDF application in Windows”
Bug #1584261 “Inkscape should register to edit PDFs in Windows Explorer”