I've pulled a recording off my Series 2 Tivo, but at that point just passed it along to the interested party to deal with the rest. In figuring out how to get the recordings off the Tivo, I found out "the rest" involves removing the proprietary Tivo "wrapper" to get at the actual content that's playable via non-Tivo players. Lots of info and a few apps available online, but...I didn't save any of the links. Sorry, not much help, I know...but hopefully provides at least a bit of context.
Alternatively, your friend could download the free "Tivo player" software (I forget the exact name) which will allow him to watch the Tivo recordings on his laptop without extracting the contents from the "Tivo wrapper".