How create link on computer folder

Hello. I treyed create my own extention based on pyRevit.
I learned a little about it. But i cant find information. Where I can find basic information how create buttons?
Now i want to create pushbutton with possibility one common folder in windows.
How can i do this?
I tried this, but it did’t work

I suspect you’re looking for this part of the documentation

Here’s some info on the bundles themeselves

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