I am attempting to open an SVG file with Internet Explorer 9 (32-bit). When doing so, I am prompted with the standard Open, Save, Save As dialog.
This happens when dropping an SVG file onto IE or opening it directly from Explorer. However, it displays properly when the full, local filepath is entered straight into the address bar.

A similar question was recently asked on Technet. The (unsatisfactory) answer suggests it is add-on related. And indeed, Internet Explorer (No Add-Ons) and Internet Explorer (64-bit) behave as expected. But neither the reset utility nor manually disabling every single add-on has helped the 32-bit version.
I appreciate any suggestions or insight into this.

image/svg+xmlMIME type. Assigning theBrowse In PlaceCLSID (mirroringtext/html, etc) solves this. Details in my answer, below. – zourtney Dec 14 '11 at 20:10