Thats not what I was saying, you need to escape the special charaters:
exec xp_cmdshell 'dtexec.exe /F "D:\DBUpdates\Mypackage.dtsx" /SET "\package.Variables[User::JobLoginPassword].Value";"8\:\;xLuZc"'
Thom~
Excuse my typos and sometimes awful grammar. My fingers work faster than my brain does.
Larnu.uk