Hello Antonio,
I don't know if you are aware that Microsoft released the Word 1.1 source code for educational purposes:
https://computerhistory.org/blog/microsoft-word-for-windows-1-1a-source-code/
https://github.com/BlastarIndia/msword
The C slips away from me, but you could still keep an eye on it to see if it can be compiled. What do you think?
Thank you!