for which software do you need a *.ati file?
The xdb-files are used to configure a PC station, if you want to use Simatic.Net OPC for example. To get a xdb-file you need to configure a PC-Station in the Simatic-Manager, and compile the station. Then a xdb file is generated, and saved in the folder XDBs of the Step7-Project folder.
Maybe it's better you write us what you want to do with the ati and xdb files.