JS CS4 & CS5 working through the ScriptListener

Question

Working through the guide there is an example:
var eventFile = new File(app.path + "/Presets/Scripts/Event Scripts Only/Welcome.jsx")
app.notifiers.add( "Opn ", eventFile)
There is 2 possible places to save this file in windows:
C:\Program Files\Adobe\Adobe Photoshop CS5\Presets\Scripts
or
C:\Program Files\Adobe\Adobe Photoshop CS5\Presets\Scripts\Event Scripts Only
I've tried both and when I open a file in Photoshop I do not get the alert.
If I go into the Script Event Manager and set the above code to run on Open Document event it works.
Is there a way to get this example to work without setting it up in the Script Event Mananger?
Cheers.

Answer 1

My experence is that you only need to set app.notifiers.enabled to true if it is not already set. It can be set to true by a script or the Scripts Events Manager.
If you register an event using app.notifiers.add in ESTK the event does not run the script unless Photoshop is restarted. If it is added as part of a script run in Photoshop or the Script Events Manager it runs without restart.
As X pointed out the scirpt can be anywhere, it doesn't have to be in one of those two locations. But for me events registered with the API remain registered from session to session untill removed.
Here is a save way to register an event. Note that it only sets app.notifiers.enabled to true if it is false and registers the open event only if there is not already one.
if(!app.notifiers.enabled) app.notifiers.enabled =  true;
var hasOpenEvent = false;
for(var e = 0;e<app.notifiers.length;e++){// the only way to tell which events are in use is to loop notifiers
     if(app.notifiers[0].event == 'Opn ') hasOpenEvent = true;
if(!hasOpenEvent) {
     var eventFile = new File(app.path + "/Presets/Scripts/Event Scripts Only/Welcome.jsx");
     app.notifiers.add( "Opn ", eventFile);
And as I understand it
new File(app.path + "/Presets/Scripts/Event Scripts Only/Welcome.jsx");
will only work with English versions of Photoshop.