Looks like sh on your system is not bash (or any shell that supports the process substitution syntax).
Update: You could always force bash:
$RT_DiffFiles= `bash -c \"comm -23 <(sort $RT_64OG_FilesPath) <(sort $
+RT_64_FilesPath)\"`;
but I'd look to see if Text::Diff accomplishes what you're after first.
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