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I'm on IE11, Win 8.1. If I set my default browser as IE, when I launch two URLs from an external program, or by running Start "http://microsoft.com" in a PoSh window, I get one window with two tabs.

However, if I manually invoke iexplore like "C:\Program Files\Internet Explorer\iexplore.exe" http://www.microsoft.com/ then I get two separate windows.

I looked in the registry at how the browser is registered, and believed it would be using the command at HKEY_CLASSES_ROOT\IE.HTTP\shell\open\command, however that is set to "C:\Program Files\Internet Explorer\iexplore.exe" %1.

Passing -framemerging appears to have no effect.

So what do I need to do when invoking iexplore.exe to allow it to launch tabs instead of new windows (which is what the Tab settings in IE are set to). I need to be able to do this without IE being the default browser.

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  • How about launching a local HTML page that opens up the tabs you need? Commented Sep 22, 2015 at 17:01
  • I can't, I don't control the first tab, I'm trying to just reuse the IE windows when launching a URL as my users would expect. (Even if I could though, that's sick... There must be an easy way to do this that Windows is doing, I'm just hoping to find what it is :)) Commented Sep 22, 2015 at 17:03
  • How about this js/vbs solution? stackoverflow.com/a/25169091/1663001 Commented Sep 22, 2015 at 17:08
  • I saw that, but I'm really sure there must be a really simple fix, so trying to avoid such madness :( Commented Sep 22, 2015 at 17:09
  • From my research I don't think there is a better way. Commented Sep 22, 2015 at 17:14

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