Hi Sally,
You could use the below link to create a custom inventory task and create reporting for this, all of this detail is in:
https://support.symantec.com/en_US/article.HOWTO124425.html
Doing a search for that CLSID, there are a few locations where that key can be found:
HKEY_CLASSES_ROOT\MIME\Database\Content Type\application/x-webex-plugin
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\MIME\Database\Content Type\application/x-webex-plugin
Or possibly the below, but I'm unsure if this a good location to get this from:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\GpcContainer.GpcContainer\CLSID
Hopefully that helps, let me know if you need anything else.
Thanks