Why Does My Tweak Utility Get a 'Requested Registry Access is Not Allowed' Error in Windows 7 and Higher, and How Can I Fix It?

"Requested Registry Access is Not Allowed" in Windows 7 and Higher

When modifying registry keys under HKEY_CLASSES_ROOT in a tweak utility, you may encounter the "Requested registry access is not allowed" error in Windows 7 and later operating systems. This issue arises due to the User Account Control (UAC) feature that enhances security by restricting unauthorized access to system resources.

To resolve this issue and add UAC support to your code, you need to modify the application manifest file (app.manifest). The manifest should be as follows:

<?xml version="1.0" encoding="utf-8"?>
<asmv1:assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv1="urn:schemas-microsoft-com:asm.v1" xmlns:asmv2="urn:schemas-microsoft-com:asm.v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <assemblyIdentity version="1.0.0.0" name="MyApplication.app" />
   <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
      <security>
         <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
            <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
         </requestedPrivileges>
      </security>
   </trustInfo>
</asmv1:assembly>

This manifest declares that the application requires administrator-level privileges to modify registry keys. By setting uiAccess="false", the application will not prompt the user for confirmation before accessing the registry.

After implementing these changes, your tweak utility should be able to modify registry keys under HKEY_CLASSES_ROOT in Windows 7 and later operating systems without encountering the "Requested registry access is not allowed" error.

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