MIF to FM: "Save As" or rename. What is the difference?

Hello everybody,

if I want to convert back a FM file into a MIF, is it sufficient to rename the file extension or must be done through the "Save As" function of FM.

A) What is the difference at the end?

The simple renaming worked perfectly for us. A customer calls and said that the "Book Update" do not working anymore.

B) What is the problem or what could be the cause?

To convert multiple files at once is not possible with FM12

C) Does anyone know of a script or tool to convert multiple files simultaneously?

Thanks for notes and

best regards