Access 2016 removed the ability to convert mdb's to accdb's.
(make not make changes to the code)
Kevin, you are adding a lot of confusion here. This is no ADP, and Access 2016 can easily both open and convert an Access 2003 mdb file - to both the older 2000 mdb format as well as the accdb format.
The issue here is rather that the file resides in a network folder. Copy the file to a local folder and make a new attempt.
I have Access 2016 and am trying to convert an Access 2003 file to ACCDB
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