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It's dizzy how some operations in Automator work.
I couldn't figure out how to output a simple, arbitrary directory path from an AppleScript module in Automator.
Just to make a simple example, not even:
Set desk_pt to posix path of (path to desktop folder as text)
..doesn't work. The icons tab under results stays inactive/greyed out
Not sure if this is a bad joke I found it myself...lost precious time before posting..
To output a directory path you have to use or the "Finder" or "System Events" and use a hfs path reference.