P5.js file can't be opened

Hello,
I only see this when trying to open my p5.js Project. The p5.js mode can be opened, but not my project. Why? It is just plain text javascript files!

Thanks for any help!

Turns out, the sketch.properties file IS necessary!

This is what is in the file.

mode=p5.js
mode.id=processing.mode.p5js.p5jsMode
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