Applescript compiles .app as directory why

Question

OS 10.6.8 with the latest patches
AppleScript Editor 2.3
AppleScript 2.1.2
On 12/1/2012 compiled AppleScripts as app (application) and output was a single file with the extension .app.  Today the same compiled script yields a directory of files none of which has the extension .app.  In fact, in the Finder you will see ScriptName.app.  But in Terminal you will see the that what Finder told you was a file is in fact a directory ending in .app. 
This is the snapshot of my ls command result in Terminal.
drwxr-xr-x  3 jchiko  staff
102 Jan  1 18:13 Open • Collection.app
-rw-r--r--@ 1 jchiko  staff   5290 Jan  1 18:05 Open • Collection.scpt
A month ago "Open • Collection.app" was a file.  Now it is directory and can not be executed from AppleWorks script menu because the file is a directory and not a file. 
What is causing my AppleScript Editor to generate .app files as directories of files?

Answer 1

I stumbled upon the answer.  Under the latest version of Snow Leopard (10.6.8) AppleScript saves the application as a bundle.  In other words, former versions of AppleScript saved the compiled application as a single file.  Now it is saved as a directory of files and folders.  Unfortunately, this breaks AppleWorks Script Menu.  I guess I answered my own question.