This is a code example modified to match your requirements. I don’t know whether it works or not, just to get you started
set remoteFinder to application "Finder" of machine "eppc://utilisateur:email@example.com"
using terms from application "Finder"
open application file id "com.apple.FileMakerAdvanced"
end using terms from
Just a short note, without going into too much detail. Are you aware that FileMaker is a client-server application? Every copy of FileMaker can share a file, via TCP/IP, which can be opened from another copy of FileMaker on another computer using Open Remote, targeting an open file (FileMaker sees open files). That is how it is meant to work, safely. Going “behind its back” may work. It may also cause your file to eventually get corrupted.