Use ${env.ProgramFiles(x86)} . The variable is case sensitive in a way that is incompatible with env.PROGRAMFILES.
[echo] env.ProgramFiles(x86) == C:\Program Files (x86) [echo] env.PROGRAMFILES(x86) == ${env.PROGRAMFILES(x86)} [echo] env.ProgramFiles == ${env.ProgramFiles} [echo] env.PROGRAMFILES == C:\Program Files
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