[TonyTrapp]

It looks looks mingw actually has several options to base its own CRT on (including MSVCRT, UCRT and various VS runtimes). Still, in the context of OP's original post, we are talking about the mingw DLLs that may or may not redirect most of their duties to Microsoft DLLs, depending on how mingw is configured.

[actionfromafar]

It's really hard these days to get Mingw to use msvcrt. It's not supported.