Detect whether Excel workbook is already open [closed]

Answer 1

This one is a bit easier to understand:

Dim location As String
Dim wbk As Workbook

location = "c:\excel.xls"

Set wbk = Workbooks.Open(location)

'Check to see if file is already open
If wbk.ReadOnly Then
  ActiveWorkbook.Close
    MsgBox "Cannot update the excelsheet, someone currently using file. Please try again later."
    Exit Sub
End If