I remember looking at MSDOS binaries with hex editors and seeing "MS Runtime Library", like many tools were written in C -- may be my memory is completely faili

I remember looking at MSDOS binaries with hex editors and seeing "MS Runtime Library", like many tools were written in C -- may be my memory is completely failing ... but probably MSDOS 5.0 included many utilities written in C? I used 5.0 with a 386, circa '93.