how to unlock a registry key on win7?

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hi, all
I was trying to change some registry key values in my C++ project on win7. one of them is HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.url\UserChoice
and what I want to change is the "Progid"'s value.
Here is the funny thing:
when I firt run my pogram, the key can be changed correctly. After that, I run IE and set it as the default browser. When I try to run my program a second time, it fails, the key above cannot be changed. I try to change it manually in regedit.exe, an error "error editing values" showes up.
So I wonder, does IE lock the key up so I cann't change it? If it's , how can I unlock it in my C++ program? Is there any API I can use?
Any answers from you will be appreciated.
Thanks.

Posted 21-Jun-11 15:22pm

ericchan1336

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ShilpiP · Answer 1 · 2011-06-21T20:07:00

I think you want to do the file association. Set IE as a default browser to open a .url file.

For Vista and Windows 7 use SetAppAsDefault.
[^]

HRESULT hr = S_OK;
	
	CoInitialize(NULL); 

	IApplicationAssociationRegistration* pAAR;
	ASSOCIATIONTYPE AsType;
	AsType = AT_URLPROTOCOL;
	
	hr = CoCreateInstance(CLSID_ApplicationAssociationRegistration,
		NULL,
		CLSCTX_INPROC,
		__uuidof(IApplicationAssociationRegistration),
		(void**)&pAAR);
	
	if (SUCCEEDED(hr))
    {
		hr = pAAR->SetAppAsDefault(lpszRegisteredApp,
                                   _T(".url"),
                                   AsType);

    }
	pAAR->Release();
	pAAR = NULL;
	CoUninitialize(); 
	
	return hr;

how to unlock a registry key on win7?

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how to unlock a registry key on win7?

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