Sub Main

 Dim GrapherApp As Object
 Set GrapherApp = CreateObject("Grapher.Application")
 GrapherApp.Visible = True

file$ = GetFilePath$(,"grf;gpj",,"Open",0)
Set plot = GrapherApp.Documents.Open(file$)

Dim Shapes As Object
Set Shapes = Plot.Shapes

Set Graph1 = Plot.Shapes.Item ("Graph 1")

Dim Legend As Object
Set Legend = Graph1.Legends.Item(1)

n=Legend.EntryCount
For i = 1 To n

Legend.EntryFont(i).face = "Times New Roman"
Legend.EntryFont(i).color = grfColorGreen
Legend.EntryFont(i).Bold = True
Legend.EntryFont(i).Italic = True
Legend.EntryFont(i).size = 18

Next i

End Sub