Say yes to all (or ignore) diagolue pop ups in macro

Hi all,

I have a macro that runs by opening up a template and updating info for a number of files.
Every time I run it however, a dialogue box comes up for every sheet saying '.... files is already open. Are you sure to want to open.'
How do I make my macro say yes to all or ignore the dialogue box?
This is my code -

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I will try that, where exactly in my code do I insert it though?

Thanks TMS