Sub SetReferences()
Dim ws As Worksheet
For Each ws In ThisWorkbook.Worksheets
With ws
For i = 1 To 1
Cells(i, 2).Value = "='R:\...\...\...\...\...\...\[S1.CSV]S1'!A1"
Cells(i, 3).Value = "='R:\...\...\...\...\...\...\[S1.CSV]S1'!B1"
Next i
Range("B1").Select
Selection.AutoFill Destination:=Range("B1:B300"), Type:=xlFillDefault
Range("B1:B300").Select
Range("C1").Select
Selection.AutoFill Destination:=Range("C1:C300"), Type:=xlFillDefault
Range("C1:C300").Select
End With
Next ws
End Sub

i'm simply trying to loop through all 52 of my sheets and fill B:C 1-300
with the value.