FileOPenEx Default folder

is there a way to specify a default folder for FileOpenEx or to set the current directory for FileOpenEx

the FileOpenEx method does not appear to have a default directory/path/folder parameter.

I tried setting the current directory but FileOPenEx appears to ignore this instruction and points to the "Documents" library.

Dim thisFolder As String
thisFolder = tbProjectsDirectory.Text
Directory.SetCurrentDirectory(thisFolder)

MSProjAppl.FileOpenEx(, [ReadOnly]:=True)

Any comments suggestions greatly appreciated.