getting the value of an optionbutton from another workbook

[d]

I want to get the value of the optionbutton from another workbook
without opening it and let the user choose the workbook.

It works fine when the workbook is open but when it is closed i get
runtime error 9 subscript out of range.

Sub macro1()


begin:
Dim Fname
Dim z, x, c, v As Variant

Dim N As Long
Dim pathname
Dim targetpath
Dim filename
Dim filenametf As Workbook


pathname = ActiveWorkbook.Path

use:
ChDrive [pathname]
ChDir [pathname]

Fname = Application.GetOpenFilename(filefilter:="Excel Files
(*.xls), *.xls")
MsgBox (Fname)
Set filenametf = Workbooks(Dir(Fname))

v = filenametf.Worksheets("sheet1").OptionButton1.Value
MsgBox (v)

end sub


Thanks for looking