app.openDoc won't work

If you are using Acrobat/Reader 5.05 or above, the PDF you are attempting to open must have that PDF's "disclosed" property set to true or your open request will return a null object insted of the requested object.
The setting of the "disclosed" property is done with a document level script:

this.disclosed = true;

You can give the script any meaningful name.

See [url=http://www.acrobatusers.com/tutorials/2007/js_document_scripts/]Entering Document Scripts[/url] by Thom Parker for instructions on how to access or create a document level script.

Thank you very much. It works now.
Is there a way to get it to open a file from a list that is displayed for the user. For instance, if the user selects a file from a drop-down list and then that file is the one that is opened.