As it is the in File.DirInternal you dont find the folder when connecting over usb. It is a secured path. Only you (your app) can access this folder. No other app. Connecting over usb will act lik "another" app in this case so the folder is not visible to the pc unless your device is rooted (I THINK SO).
Try to search for the folder in \Phone\Android\data\[packagename]
PS: Please use code-tags when posting code here in forum!
Dim de As String = File.DirRootExternal
Log ("DirRootExternal = "&de)
Dim mtc As Matcher = Regex.Matcher("(/|\\)[^(/|\\)]*(/|\\)",de)
Dim extsdcard As String = de
If mtc.Find = True Then
Dim mnt As String = mtc.Group(0)
Log ("mount point = "& mnt)
Dim dirs As List = File.ListFiles(mnt)
For Each f As String In dirs
Log ("Device = "& f)
If f.ToLowerCase.Contains("extsdcard") Then
extsdcard = mnt&f
End If
Next
End If
Log("extsdcard="&extsdcard)
For Each f As String In File.ListFiles(extsdcard)
Log(">"&f)
Next