Relevance substitution evaluation strangeness

hi AlanM, sure, i could do that workaround of allowing the forward slash to be used in Windows, but I need to know why a relevance subsitution error occurs on something as simple as…

(if (name of operating system as lowercase contains "win") then "\" else "/")

…in one task, but works in another task.

It must not just be me because here’s another post with the same issue…