I don’t know where the official broker version is stored, but here are a few clues re broker server version, for what they are worth.
\wm6\Broker folder contains a readme whose title is indicative, eg. mine shows:
Broker_ProgramFiles_6-1_SP3_README.html (for 6.1)
BrokerJMS65_SP1_readme.htm (for 6.5)
Also, the Broker Server tab on WmBrokerAdmin shows
6.1.0.3.39 012705 for 6.1/SP3
6.5.0.1.565 091505 for 6.5/SP1
Also, when I try to download a Broker SP with installer, the component is grayed out, indicating that it is already installed.
There must be a better way to identify the version.
#Integration-Server-and-ESB#Universal-Messaging-Broker#broker#webMethods