Discover The User's Desktop Folder?

I'm making a little application in visual studio which loads a ROM in an emulator. I have two emulators and 20 ROMs.I made a form and added a few buttons. When you click the Button it opens a new form and closes the old one. Then on the new form I have four buttons: each one loads a different ROM in an emulator. So when you press Button1 this code is triggered:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles yellow.Click
Shell("C:UsersshiftyDesktoppokemon gamesEmulatorVBAVisualBoyAdvance.exe ""C:UsersshiftyDesktoppokemon gamesRomsYellowPokemon Yellow.gb""", vbNormalFocus)
End Sub

It works fine - I click it and it loads the game in the emulator. The bit im having trouble with is the file paths. If I send this application to a friend, it would still look for "C:UsersshiftyDesktop" - but that's on my computer, not his.Is there a way to make the application look for the file on his computer (without changing the file path to (C:Users""his user name""Desktop))