webbrowser always display ie9 even after changing to ie8 at FEATURE_BROWSER_EMULATION



I'm using the webbrowser,  installed IE9,  but I want to use IE8 for one winform program, so I changed the regedit:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_BROWSER_EMULATION]
"SpiderStudio.exe"=dword:000022B8

but it always shows ie9, not ie8 on webbrowser.

I used the release version, not debug version.

Awen