I am surprised at such negative responses.

I am asking about alternatives to LibreOffice for a reason (stated)

Pandoc library and Microsoft Markitdown -- that other helpful comments suggested -- seem like two options that might actually work in my case and I will give them a try. My asking here was fruitful.

Running python and using python libraries is allowed on our work pcs but not running arbitrary software and EXEs with or without an installer. I cannot override company security policy, and cannot simply "talk to" our infosec team and get them to allow me to install stuff. Hope this clarifies.