Wilfred wrote (2023-02-23):

 Ol>> ANSI escape codes?

 WvV> I could get the same above sequences with a windows program with some
 WvV> wincon.h functions and this mode:

 WvV> https://learn.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences

 WvV> But this works in Windows 10, not in Windows XP... :-(

Are there any XP users of FMail?

Maybe port to ncurses or pdcurses?

https://sourceforge.net/p/mingw-w64/wiki2/NCurses/
https://pdcurses.org/

Might be the sledgehammer for a nut ;)

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