Rack File Compatibility with Forte 4
Forte 4 can load rack files created in Forte 3. However, a rack saved in Forte 4 may lose some functionality when loaded in Forte 3.
As far as we know, there are no “breaking” changes. If you load a Forte 3 rack in Forte 4 and resave it, it should work as it always did on Forte 3. However, using new features in Forte 4 will obviously not work when reloaded in Forte 3.