Directory or Folder exists?

[DGDanforth]

No I didn't because of the (seeming) need to access a dll. My approach just uses a WinApi call (WinApi.GetFileAttributesW)

Yes, my suggestion requires accessing a Windows dll.
But WinApi is a Windows dll, so what is the difference?

Because the interface and all the work has been done for WinApi.
I must apologize that I did not read your post very closely.
Do you have the interface module for the dll?
Do you have the appropriate functions well specified?
-Doug