If your looking for a way to convert a 2006 file to 2005, and still
maintain the feature tree, its impossible. Like mentioned above you
can save the 2006 file as an .X_T parasolid, but you will loose the
features in the feature tree. This is known as a dumb solid. The
inability to save solidworks files back to earlier versions has long
been a complaint of many users, and can be frustrating if your
customers dont stay up to date with their versions. The same used to
hold true for Autocad drawings, untill DWG editor gained popularity.
This is a big double edge sword, IMO. It would be nice to have the
ability to just open files and have them be backwards compatible. But
then I ask the question, what would the "Flex" feature be before 2005?
What would you make a new function be in the older version? Not saying
that it can't be done, but how can you have the parametrics or control
over a feature that did not exist? Or at least not in the same way in
the older version. Sweep with a Twist.... prior to 2005, what would
Not trying to start a war or anything, just throwing it out there for
response as to how this could be handled with the intelligence that we
created with. I agree, feature recognition is a great tool, but getting
some things to come back that are not so prismatic might be harder and
you have to do it manually.