Wow, that's crazy. Microsoft indeed uses StrCmpLogicalW in Explorer in Windows 10. And it produces very funky results.

The issue is that on Linux, say scandir() doesn't use that weird sorting by default. So if someone uses WinSCP to connect to a Linux file system they will get very inconsistent results because of this weird Windows-centric sorting.

PS. BTW, Microsoft themselves recommend to use a totally different set of APIs for sorting, i.e CompareStringOrdinal for NTFS file names.

WinSCP uses Windows StrCmpLogicalW function:
https://learn.microsoft.com/en-us/windows/win32/api/shlwapi/nf-shlwapi-strcmplogicalw
Which should give WinSCP a consistent behaviour (e.g. the same like in Windows File Explorer).

Thank you, if fixed it.
Although it is still a bug. For the "natural number sorting" those numbers must be separated by a whitespace.

You probably want to turn off "natural order numerical sorting":
https://winscp.net/eng/docs/ui_pref_panels

I'm not sure if it's a bug or what?