>Hi George,
>
>What happens if the ProgId changes (new version) ?
>
>The thing is I want to use Dynazip to extract some files but I want to know if Dynazip is installed already or not.
>
>thx
>
>Guillaume

The ProgId shouldn't change. It's how you create an instance of the COM server. The CLSID is another matter, but that shouldn't be an issue.