Photo Viewer

Hello! Everyone

I have new program on Photo Viewer. Everything is alright, but i'm getting little confuse on the below code:

Private Sub File1_Click()

If Right(F,1) <> "\" Then
F = File1.Path + "\"
End If
image1.Picture = LoadPicture(F + File1.FileName)

End Sub

Here i have set variable F to string. What is the above code is saying, it will be nice of you if anyone help Me? Thanks :)