clean method for closing excel file without leaving a shell or closing other excel files

Hi all,
I need to shut down an excel network file after 20 minutes. I initially used simple code like application.quit or the close method but often when closing an empty shell was left behind which was untidy. I tried a few things to no avail and finally settled on the below which works in so far as no shell but now often closes other excel files that are open at the same time.
Can anyone suggest a cleaner more robust method please?

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On my computer (Windows 10) if there is a PERSONAL.XLS or PERSONAL.XLSB file that exists it counts as an open file.

SubFolder in red below is User Dependent:
Location: C:\Users\Owner\AppData\Roaming\Microsoft\Excel\XLSTART\personal.xls

I modified sintek's code as follows:

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Lewis