There's more to experience when you log in!
There is no change to the tab file format between v17 and v2019.
You'll, however, find that these features will create a v2019 workspace if you use any of them:
You can always find an overview of the file format changes in the Help System. Look for File Versions and TAB, MIF/MID, and WOR Support.
Set Window FrontWindow() Printer statement