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Asked: 2026-05-30T22:00:19+00:00

I need to read/write some information in the Windows registry from my BHO. On

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I need to read/write some information in the Windows registry from my BHO. On Windows Vista/7, I create a new key under HKEY_CURRENT_USER\Software\AppDataLow\Software. This works fine, even in protected mode.

However, it does not work on XP. I tried to change the registry to HKEY_CURRENT_USER\Software\Classes\Software or HKEY_CURRENT_USER\Software, no luck.

What is the right registry key to use on Windows XP from a BHO?

IEGetWriteableHKCU does not exist on Windows XP, it was first added in Windows Vista

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  1. Editorial Team

    Before Vista you will have to use a different approach… during installation of the BHO you need to tell Windows/IE which key(s) you want to be writable from the BHO…

    There is a whole API family to handle this (supported from WinXP SP2 and up according to MSDN):

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