@EricZhou No problem ! I actually happened to figure all this out through trial and error (yes, that includes deleting the Worlds folder and seeing what would happen in the Quick Launcher following it) Down to the naming of the world file, the standard format (as a matter of fact, scene-Android-something.vrcw is also a format for Quest worlds) and how you can basically have as many as you want in there with various names and they will all show in the list and mostly, how those files and the __data world files are both bundles alike, just named differently (but to be also careful to not confuse __data files that are ".vrca" files, which are avatar bundles, and the ".vrcw" files which are world bundles Though, I do thank you still, for you have taught me that "ba" and "b9" folder namings have different meanings (new vs old), which I wasn't aware of. Would had helped me in my earlier search of the MMD world file if I had known haha