Is there a way to read out code from old pde file?

I want to pick up processing again after years of inactivity, but when I open an old file I get an error:

I already tried to install an old veriosn of processing but I get the same result.
Is there a way to get the code file from the pde file without running it so I can rebuilld it in the latest version?
Thanks for any answers!

pde is just a text file

you can open it with any editor, for example windows Notepad

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didn’t know that! thank you!

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