You can store any sort of file in Windchill, but I think what you're asking is for an integration between Framemaker and Windchill. Arbortext has this integration built-in (e.g. click here), but I'm not aware of one for Framemaker. There is an API for integrating third-party software with Windchill but that would take quite some effort (easily into six figures). It's cheaper, easier, better to use Arbortext with Windchill but of course that may not be an option your team is willing to pursue.
