Private Sub Command1_Click()
OpenPhotoViewer "E:\My Folder\test.jpg"
End Sub
Private Sub OpenPhotoViewer(ByVal path As String)
Dim rundll As String, photoviewer As String, args As String
rundll = Environ("SystemRoot") & "\System32\rundll32.exe"
photoviewer = Environ("ProgramFiles") & "\Windows Photo Viewer\PhotoViewer.dll"
args = """" & photoviewer & """, ImageView_Fullscreen " & path
Shell rundll & " " & args, vbNormalFocus
End Sub