How can I open more than 15 files at once on Windows 7?

Open regedit and navigate to:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer

Add this case-sensitive DWORD (32-bit) key:

MultipleInvokePromptMinimum

Set the value to

P.S. 16 is not a hard number, but actually indicates "unlimited", so putting in 17 probably will not work.

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