Modules & VBA :: Closing Already Open Excel File From Access

I want to delete an excel file from within access vba. Problem is that if the file is open, it obviously cannot be deleted. so I need to check to see if that specific excel workbook is open and if it is, I want to close it before I can delete it.

All of the answers here involve creating an excel object and opening it before closing it. If I do that all that happens is a second instance of the workbook opens then closes leaving the originally open workbook still open.

Sub xx()
Dim XLapp As New Excel.Application
Dim ObjXL As Excel.Workbook
Set ObjXL = XLapp.Workbooks.Open("C:dropboxexcelimport.xlsx ")
ObjXL.Application.Visible = True

[Code] .....

The above code demonstrates my problem, if the import.xlsx file is already open then the code just opens another instance of this workbook and then closes it again leaving the original workbook open and as such cannot be deleted.