I have many clients who are getting IE10 via Windows Update and cant view websites properly. I have set some of them to use compatibility mode, but this still doesn't work since it is still using IE10. I need to figure out how to set IE10 to always open in IE9 browsing mode. I know they can press f12 and change the browser mode there, but this seems to last only for that session. Any help is greatly appreciated.

  • 5
    Real answer: fix the web sites they're visiting. :) Sep 10, 2013 at 17:36
  • Lol True Story. I wish I could, but most of them are medical related sites and they dont support IE10 yet due to "potential security holes"
    – msindle
    Sep 10, 2013 at 17:38
  • 2
    Secondary answer: Prevent IE10 from being download via Windows update.
    – user201262
    Sep 10, 2013 at 17:38
  • I use Internet Explorer.....to download Chrome. do these sites function properly on other browsers? can your users use these other browsers? like say Safari? I imagine a lot of the users being in the medical field are probably using iPads or Macbooks(or whatever they are called these days)
    – Malachi
    Sep 10, 2013 at 20:48

1 Answer 1


You can use the FEATURE_BROWSER_EMULATION feature of Internet explorer.

Start regedit.exe, go to

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION



create a DWORD iexplore.exe and set the value to 9999 (0x270F).

  • Holy Cow that worked! Thank you Thank you Thank you! I've been tearing my hair out all morning trying to fix something that should have been a quick fix!
    – msindle
    Sep 10, 2013 at 17:46

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