JobScheduler can monitor file creation, file change and timestamp change with a (standalone) job. This job can then start a job chain or job group.
An example how to configure a "file-watcher":
<job name = "scheduler_file_notification_1">
<script language="shell">
<![CDATA[
set
echo %SCHEDULER_JOB_NAME%
echo %SCHEDULER_TASK_TRIGGER_FILES%
rem del %SCHEDULER_TASK_TRIGGER_FILES%
]]>
</script>
<start_when_directory_changed directory = "c:/temp" regex = "^file[1|2]\.xml$"/>
</job>
This job will watch the folder "c:/temp" on a ms-windows system. With the regular expression one can define, what file(s) has JS to watch. In this example the regex means, that every event regarding the files "file1.xml" and/or "file2.xml" will fire the execution of the embedded script (in this case it will echo some values for JS-Environment Variables to stdout).