FMP Adv 15. I’m using the file open script step to open a filemaker file (file2). File2 has a script trigger on first window open but it does not run when it opens. Is there a way to run a script in file2 when it opens?

Do you have the option set to open file2 hidden?  The script trigger does not work on file open but as the name says, onFirstWindowOpen.  If you open file2 in such a way that it does not render a window then that trigger does not run.

This is a use case where I would not rely on triggers.   You want to explicitly open file2 and have it run a script.  So do that explicitly in your script:

- open file2

- run script in file using the "perform script" script step