I'm not sure that this is possible at all.
You should update to FileMaker server which will start the filemaker server service without requiring a login.
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Mike is right,
to start an application, that must be done under a user account. Only a service can be started at bootup. The only way I can figure how you may do it would be to autologin a user at boot time, and then have the file open.
As you can read in other posts on this forum, sharing a database from FMP/FMPA is not the recommend method to 'serve' files. Sure there is a price for the server, but then how much do you value your data ?
after your comments I added another row using regedit to start a .txt and the result is the same, both apps start after login.
Thank you again