There probably is a way to do this
For drawings how does one change in a bulk way the:
Document Properties – Line Font – Visible Edges – Thickness – “to 0.0138in”
For all existing drawings in a subdirectory?
You might have luck with AngelSix's BatchProcess. It can do various things to multiple files, and changing line widths would be the sort of thing this is intended for, but I can't tell specifically. They don't show much on their website. But there's a free trial and it might work.
There is probably a way using SW Task Scheduler.
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