On a relatively fresh installation of Win10, I tried to install mp3tag to the start menu folder Audio/mp3tag. Instead, it gets installed to the default mp3tag.
I see in the global ProgramData/Microsoft/Windows/Start Menu/Programs, there is no Audio folder. However, there is an Audio folder in /users/steve/appdata/roaming/microsoft/windows/start menu/programs.
I installed some other app earlier and had it put its stuff under /audio. It looks like the other app created Audio in my private area instead of making it global.
I'm not sure what happens in mp3tag when it is doing a "for everyone" installation and it can't find the folder ("Audio/mp3tag") for installation. Maybe it finds the personal one and then doesn't apply it correctly for a global installation.