Closing Excel files from VB (1 Viewer)

I have an excel file that I want to update a cells data then save the file anc exit out of the excel application. It seems to work ok except when it comes to closing the excel application. It seems to keep the excel file locked this is the code I have to open/close the file

Dim app As New Excel.Application

app.Workbooks.Open "test.xls"

app.Range("A1").Select

ActiveCell.Offset(0, 0).Value = Date

ActiveWorkbook.Save
app.Workbooks.Close
app.Quit

Anyone know what I am doing wrong.

Just guessing but try to specify the file to close.

app.Workbooks.Close "test.xls"

Tried That, although in slightly different syntax.

app.workbooks("name.xls").close

The file excel file I have open does close eventually. Having a closer look at the system I seem to have multiple instances of EXCEL.EXE running though. If I have run this a few times. Just does not seem to shutdown the running application.

Thanks for your response