A family of Microsoft relational database management systems designed for ease of use.
In 22 years of using Access I confess I have never used the wizard to split a database. However, I just tried it now in Access 2013 (15.0.4663.1000) and it worked fine, so I can't say what the problem is on your computer.
However, it is easy to split a database manually - I have done it hundreds of times:
- Take a backup copy of the database.
- Take another copy of the database and rename it as the back-end (e.g. MyDatabase Data.accdb)
- Open the new back-end and delete all the objects EXCEPT the tables.
- Open the original database (which is now the front-end) and delete all the tables (except the system tables - MSys* - if they are visible)
- Use External data > Import & Link > Access to link all the tables from the back-end to the front-end.
Good luck!