bat file should choose install instead of test on scr-file

i'm creating a cd-drom with a flashmenu that starts with autorun.ini
When clicking a button in the flashmenu, a bat-file is being called with fscommand.
This bat-file should start installing a screensaver (screensaver.src)

My batch-filecommand is: start screensaver.scr

This is ok, but instead of installing the screensaver, the it opens the screensaver config menu.

When rightclicking the screensaver.scr i can see a menu that says:
- TEST (in bold, so default action)
- configure
- install

So what is the command to have it install directly from the batch?