Reference Worksheets Using Variables In A Table

I am very green at this so be gentle with me.

What I would like to do is use table data in a master document to move between documents in VBA. I have other grand plans but this is the first step. And I am stuck already

The cell U3 in my master doc references text "D_1" and I want this to change the window / workbook to "Week 1.cvs".

If I change the main line to Windows(D_2).Active this functions perfect.

I will of course populate this significantly more once I get this to function.

Any advice greatly appreciated.

Cheers

Sub Window_Display_Test()
'
' Window_Display_Test Macro


Dim D_1 As String: D_1 = ("Week 1.CSV")

For i = 3 To 11

Dim Cur_Window As Range: Set Cur_Window = Range("u" & i)

MsgBox (Cur_Window)

Windows(Cur_Window).Activate

Next i

End Sub

Expected this to change between open windows / workbooks.

Instead came up with a RUNTIME error