You probably want to turn off "natural order numerical sorting":
WinSCP uses WindowsAlthough it is still a bug. For the "natural number sorting" those numbers must be separated by a whitespace.
I'll look into it.PS. Also as a side note. You may consider using a designated service to dispatch email notifications from this forum instead of using just a built-in phpBB2's mail() function. Otherwise, no matter what I do Microsoft puts them into junk. You either have misconfigured MX- and A-records, or it may require you to adjust DKIM and SPF settings as well. Keep in mind that it's still a lose-lose situation if you don't stay on top of it. I rather prefer using services like Mailchimp, Sendgrid, Sendinblue, etc. Some have a free tier if you don't send out a lot of emails. They are designated for this kind of mailing and work really well. (I myself use Sendinblue. It's a French company.)
WinSCP uses Windows
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