RE: Duplicate program class keys in HKCR

Tech-Archive recommends: Speed Up your PC by fixing your registry

Hi Tom,

Thanks for your feedback!

Yes, I understand your scenario better now.

Based on my research, there are 2 keys under HKCR with the same CLSID of
{3E6C7FFD-743D-4265-8E3D-0D7EA889DFDB}:
1. Microsoft.ITIR.WordWheelBuild
2. Microsoft.ITIR.WordWheelBuild.5.4

They both have the same default value of "Microsoft Infotech ITIR Word
Wheel Build". Is this the same condition as yours?

I do not think registry enforce any unique constraint for the keys under
HKCR. Normally, the all the CLSIDs under HKEY_CLASSES_ROOT\CLSID\ are
granted to be unique, this is enforced by COM CLSID feature, not registry
constraint: 2 applications can not use the same CLSID.

However, in our scenario, the first key and second key are used by the same
COM component. They are 2 different progIDs, one with version, another
without version number, both point to the same CLSID.

So I think you can set a rule for sub keys under HKEY_CLASSES_ROOT\CLSID\,
since CLSID is granted to be unique. However, there is no such rule under
HKEY_CLASSES_ROOT\

Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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