I'm looking for editing a custom visual I found in the internet (its tooltip shows some data I'd like to hide).
I found out that the pbiviz file is actually a zipped folder, I extracted it and got a package.json and a folder with another .json containing the source code of the visual. The source code is minified, but I managed to make the fix there.
Now I don't know how to pack the pbiviz file again. I tried to zip the folder and rename it to .pbiviz, but Microsoft Power BI tell me it "isn't a valid custom visual" (I tried it also without editing, the error message is the same, what makes me conclude this isn't the right way to package it).
I'm trying to use Microsoft developing tools to build this package, but I still couldn't make it work.
TL;DR: I need help to edit a pbiviz source code, package it back and use on Power BI.
Instead of zipping back, you can keep the original .pbviz file, open it with a software like 7-zip and replace the files you need. This way, Power BI still recognizes it like a valid custom visual.
Important: it's necessary to replace the guid in every file for a new one, otherwise your fix will be replaced by the version on marketplace.