0.91 unable to associate Inkscape with SVG in Win7, 64-bit

Hi Friends,
I think this may be a bug, but I thought I better report here first, in case it's not.

This on win7, 64-bit and Inkscape 0.91, 64-bit (I installed the 7z version, but there's another report in InkscapeForum.com from someone who installed the MSI version).

Steps to reproduce:

-- right-click on any SVG file
-- choose Open with
-- in Open With dialog, click Browse button
-- locate inkscape.exe, click Open
-- Inkscape does not appear in the Open With dialog, as it normally should
-- if I click OK anyway, it just applies whatever program was highlighted (in my case, now IE is shown as the default)

Is there some other way to associate Inkscape 0.91 with SVG in Windows 7, 64-bit?

Thanks for your help :-)