AppleScript - Launching an app package, problems

Question

Help!
  I have a Filemaker runtime app that I want to launch using a single icon that I can distribute easily (and have a drag-install directly into the user's App folder). I found a page that allows me to do this using AppleScript:
http://campsoftware.com/2010/11/filemaker-runtime-packages-and-installer/
They have me using a script that looks like this:
-- Path to the runtime in the App
set appPath to (((path to me) as text) & "Contents:Resources:PSD:PSD.app")
-- Convert path to a POSIX path
set newAppPath to POSIX path of appPath
-- executing the script file
try
    set command to "open " & newAppPath
    do shell script command
end try
I save that script as an app, then I go into the app's package contents and drop my runtime in the Resources folder. That way, the file path knows where to find the .app and launch it. but when I double-click, it does not work. At all. It just tries to launch in the dock, and immediately terminates, never opening the runtime app.
I'm positive that the file path is correct. How can I fix this problem?
thanks for your time.

Answer 1

The 'quoted form of' text solved the issue. Here's the script in its working condition:
-- Path to the runtime in the App
set appPath to (((path to me) as text) & "Contents:Resources:PSD:PSD.app")
-- Convert path to a POSIX path
set newAppPath to quoted form of POSIX path of appPath
-- executing the script file
try
    set command to "open " & newAppPath
    do shell script command
end try
Thanks for all the help!