This format, %mi (Minimised Icon), supplies the name of an icon resource (as a standard character string) to be used if the window is minimised. The %ww (Window Style) format must be used in order for it to be possible to minimise the window.
For example:
WINAPP 'd10.rc'
INCLUDE <windows.ins>
i=winio@('%wwDon''t be late for tea!%mi[tea_icon]')
END
The file d10.rc contains:
tea_icon ICON tea.ico