Set-ACL on a file

Hi Guys,

I have a file in a deployment I'm working on currently that I need authenticated users to have access to.  I haven't touched on ACL much in the past besides a few files in MDT that I used cacls.exe for, but I'm looking to add some configs to my powershell deployment script.  The code I'm using is -

$acl = get-acl C:\programdata\sun\java\deployment\security\trusted.certs
$acl.SetAccessRuleProtection($true, $false)
$rule = New-Object System.Security.AccessControl.FileSystemAccessRule("Users","FullControl","Allow")
$acl.AddAccessRule($rule)

I run that and nothing looks to be changed on the file.  This is my first time using this, so I could have something off :)  Any help would be appreciated.