My guess is that one of those folders is the previous version of Mojo. But the folders are ClickOnce's private info and I'm only guessing.

People are not supposed to need to look at those folders (that's why the names are ugly), and if they do, then I'm doing something wrong. Maybe I should add or change something so UAC can be turned off for Mojo in a convenient way. Or maybe Mojo needs a traditional MSI installer that puts the binaries in a user-selected directory.

In the meantime, as a tester, you can find Mojo's "real" installation folder by launching it from the Start Menu or desktop shortcut. Then click "Show installation directory" on the Debug menu.