Data Folder does not open. Explorer file not found
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It is about Data Folder for MT5 in Windows -

It is about how to find Data Folder in Mac computer -
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MT5 Build 4120 MacOS M1-Data Folder Copy Paste Issue
Julia Lopez, 2023.12.31 19:22
Well I use Windows and it is when I click on Data Folder (Of course) that I receive this message.
I think - it is some error in your computer/Windows (Windows 10 64-bit, right?), or you are using old Windows version, or your anti-virus is blocking, or any.
You can google about it for advice/decision, for example (in google):

and there are more advices so - search in google.