Yes, the .pd extension is not mandatory! In fact, it doesn't even have to be a "real" Pd patch. You can also open a .txt file containing a list of arbitrary Pd messages.

On 09.06.2020 12:55, Mario Buoninfante wrote:
actually it seems .pd is not mandatory, right?

Anyway I like this :)
pd -open "mypatch1.pd: 1 2 3" -open "mypatch2: foo bar"

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