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I'm trying to set Single-Click (in explorer) in some Kiosk-like PCs, running Windows XP, but I can't find any way to set it through GPO.

Is there any way to do this?

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You mean for delivering the client application for many machines? – l0c0b0x Jun 30 '09 at 16:37
I meant Single-Click in Windows Explorer, so that the user can open the icons on the desktop with a single click. – Nelson Reis Jun 30 '09 at 16:42
ah.. ok. I was thinking it was VNC single-click ;) – l0c0b0x Jun 30 '09 at 16:59

You're not going to be able to change this with "Administrative Templates". This is one of those annoying values that's stored in a REG_BINARY structure (specifically HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellState) and is wholly undocumented in structure.

You could script a registry merge to this value, but if Explorer is already running when you change this value you won't see the effect until the next logon. Explorer is able to update itself when you change this setting in the menu via some undocumented API. Yay undocumented APIs... sigh You'll also be changing more than just the single-click behaviour if you merge over top of it-- there are other things in this opaque binary value.

(I'd love Microsoft to take the attitude that 100% of settings in Windows, Office, etc must be customizable via Group Policy.)

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The policy is called "Turn on Classic Shell"

User Configuration | Administrative Templates | Windows components | Windows Explorer

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