It means the file is set not to show in the Open Remote dialog. If you unhost the file, then choose File > Sharing > FileMaker Network, you'll be able to see a checkbox labeled "Don't display in Open Remote File dialog." That checkbox is checked for the file in question.
Thank you a lot Mike,
I've realized that it was a very silly question ;-)
My real problem is that the solution is used also from iPads and iPhones and it as been working very well for a couple of years but now the iPads are loosing the wi-fi connection very often and unpredictably.
We changed the the wi-fi modem with a new AirPort Express.
Everything looks Ok (extend privileges are OK - no fmreauthenticate, computer doesn't go to sleep...)
But the iPads are loosing the connection requiring the user to relogin.
Any ideas that could help?
Actually, in 13, you no longer need to unhost the file in order to change that setting.
very basic, but useful function :-)
Well, that's good news! Thanks.