Where your content is (Embedded vs File Resources vs Etc) has nothing to do with what format they’re stored in. If you want your assets to be PNGs and such instead of Pipeline-Tool-built XNBs, just add references to those files in your project. MonoGame can read straight from PNGs in a few ways (check documentation). As for WAV and other assets, the way those are processed by your application is really up to you.