Comment 14 for bug 1654461

I have a similar result for a 32 bit install, see below.
however these settings are not sufficient to guarantee that Inkscape will be the default program for svg files. In my case IE11 is the default program for svg files, which is the way I prefer it. But Inkscape will show up when you do a right click and select "Open With..."

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Key Name: HKEY_CLASSES_ROOT\Applications\inkscape.exe
Class Name: <NO CLASS>
Last Write Time: 9/1/2016 - 8:53 AM

Key Name: HKEY_CLASSES_ROOT\Applications\inkscape.exe\shell
Class Name: <NO CLASS>
Last Write Time: 9/1/2016 - 8:53 AM

Key Name: HKEY_CLASSES_ROOT\Applications\inkscape.exe\shell\open
Class Name: <NO CLASS>
Last Write Time: 9/1/2016 - 8:53 AM

Key Name: HKEY_CLASSES_ROOT\Applications\inkscape.exe\shell\open\command
Class Name: <NO CLASS>
Last Write Time: 9/1/2016 - 8:53 AM
Value 0
  Name: <NO NAME>
  Type: REG_SZ
  Data: "C:\Program Files (x86)\Inkscape\inkscape.exe" "%1"