This is now unsupported in Windows 10, see : http://blogs.windows.com/bloggingwindows/2015/05/20/announcing-windows-10-insider-preview-build-10122-for-pcs/ We should use the new "Modern UI" prompt here.
The "default programs" control panel still works and it is used by Internet Explorer. But flyout is no longer supported.
Duping to bug 1167294 which has slightly more information
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1167294
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