https://bugs.winehq.org/show_bug.cgi?id=50230
--- Comment #4 from Adam Michalik adam@michalik.es ---
affecting several apps/games which it isn't.
It is not *known* to affect several apps, but given that str*_s are quite general general function, I think it's safe to assume that signtool is not a literally unique one that's using them.
Maybe you provide a list of them here by using 'winedump -j import foobar.dll'
Thanks for telling me about winedump, I didn't know about it. However, after patching my wine installation to add these functions to wine's ntdll.dll, signtool no longer complained about any missing functionality from ntdll.