Running a Powershell script using bigfix action script

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Welcome to BigFix!

You could just use the PowerShell script type directly if you are on a recent version of BigFix. Otherwise, the curly-bracket is evaluated as a Relevance substitution; you need to escape the open-curly-bracket by doubling it as in

try {{
    Do something
 }

See Tip: Escaping curly brackets for substitutions in ActionScript for more examples