Using COM interop with pywin32 to open files (and edit and save, save as...) with MS Word (and other office apps). Here we'll open a docx file and save it as pdf.

doc2pdf_with_COM.py

"""
Using COM interop with pywin32 to open files (and edit and save, save as...)
with MS Word (and other office apps). Here we'll open a docx file and save
it as pdf.

You need to have office installed.

Source: http://timgolden.me.uk/python/win32_how_do_i/generate-a-static-com-proxy.html
static - dynamic proxy to office COM obj.

"""

import win32com.client
from pathlib import WindowsPath

wdFormatPDF = 17

in_file = WindowsPath(r".\myfile.docx").resolve()
out_file = in_file.with_suffix(".pdf")

#print(out_file)

# opens the word application
word = win32com.client.gencache.EnsureDispatch ("Word.Application")
# we get the document object
doc = word.Documents.Open(str(in_file))
# if you want to make the window visible
# word.Visible = True
# save as pdf
doc.SaveAs(str(out_file), FileFormat=wdFormatPDF)
doc.Close()
word.Quit() # will quit every open word application!