Open WB / Run Macro / Save changes /Close WB

I already wrote a code to open a file and run the Macro. But im just having trouble saving it and closing it. I tried the function Workbooks.close but this closes all of my open workbooks, I just want to close that specific one.
Here's what I have so far.

Sub Transfer_Replace()
aux = Application.GetOpenFilename("File, *.*")
' open workbook if Cancel wasn't pressed
If aux <> False Then Workbooks.Open aux
'''Call Macro
Replace1
End Sub

I've used the following method a few times with success.

Dim destWorkbook As Workbook

Set destWorkbook = Workbooks.Open("asdf\asdf\asdf\asdf\sample.xls")

destWorkbook.Save
destWorkbook.Close

Thanks. That works fine.

Mark the thread [SOLVED] if everything you wanted is here.