If you have a DITA topic that references a Creo/Illustrate graphic which is stored in Windchill, then you can double-click in Editor to launch Creo/Illustrate. Note that this can be a .c3di source or a .pvz. If it is a .pvz, then Editor will locate the associated source in Windchill and open it in Creo/Illustrate.
This was added in 7.0 M030.
We have not yet added this support for other graphic types.