do you want something like a Wizard or a Starting form?
You can make your own Wizard form.
1.- Make a new form
2.- Put some textboxes to enter the data paths
3.- Put a command button for each textbox for paths
4.- Create a table with the fields to hold the paths and save the paths to the table
5.- When starts your app check the table if has a record, if don't have records, show the wizard form, else set the paths from your table and sowh your menu

See at the help:
Set Path To
Set Default To
GetDir() && To get the path to your data on command buttons
MKDir && If the user type the dir on textbox and don't exist
Directory() && To check if exist a directory


Hope this help

Mauricio