I am looking for a solution to convert Visio drawings to AutoCAD (DWG). Since Visio does not support line types and fonts for DWG export the built in function is not acceptable. Microsoft declares it as a feature.
Some interesting links regarding older and latest Visio productsa and the hard task of conversion or melding efforts. Hope you get to the exact instance you are trying to find.
Good Luck, as I often have a hard time with Viso -> Autocad more than the reverse.