Lookup Range In Closed Workbook

I'm using the following sub (thx Benvolio 2001) to do a vlookup (of A1 in Sheet2) and drop the resulting value ("found") in b1 of sheet2. Here's my question: I'm having trouble modifying the rng to use a closed workbook in another folder i:other folderotherfile.xls. The "Inventory" tab is in otherfile.xls
How can i do this? use the vlookup in a closed workbook somewhere else?

Sub Example_of_Vlookup()
Dim lookFor As Range
Dim rng As Range
Dim found As Variant
Set lookFor = Sheets("Sheet2").Range("A1")
Set rng = Sheets("Inventory").range("A4:D500")
On Error Resume Next
found = Application.Vlookup(lookFor.Value, rng, 4, 0)
Range("b1").value = found
End Sub