Problema Problema download in %appdata% minecraft

[TremoBang]

Non riesco a far si che mi installa una mod in %appdata% mods. Ecco il codice (con visualbasic)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
My.Computer.Network.DownloadFile("URL", "C:\Users\%username%\AppData\Roaming\.minecraft\mods\SGR Logo.jpg")
MsgBox("ChickenModPack Installata!", 0, "Auto Installer")
End Sub

Grazie in anticipo.