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Editorial Team
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Asked: 2026-05-24T18:59:19+00:00

I am setting a registry key with invalid value (setting a REG_DWORD key value

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I am setting a registry key with invalid value (setting a REG_DWORD key value with a REG_SZ). Will registry hold the value which it was having it before or will it reset it to its default value?

For example. I have set REG_DWORD key and have set it to value ‘4’. Default value of this key is ‘2’. Now when i try to set this key with api ‘RegSetValueEx(…)’ with an invalid REG_SZ value. Set was success. Now if i get this key value, will that be a default value ‘2’ or will it be previous set value ‘4’??

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  1. Editorial Team

    RegSetValueEx Sets the data and type of a specified value under a registry key.

    It will just change the type of the stored value to REG_SZ and set the value you specified, it doesn’t check what value or type there were before. So when you read the value you’ll get the last value you set there. There’s no such thing as ‘invalid’ REG_SZ.

    Also forget about ‘default value for the key’. It’s not what you think it is. This is not the value that the API will return if something fails, it’s just a fancy name for an anonymous value.

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