[Python] pywin32: Word.Documents.Open(filename) wants a string, how can I give it a BytesIO...

The function win32com.client.gencache.EnsureDispatch('Word.Application').Documents.Open() wants a filename as input, to open an existing word doc. I have a doc created in memory with docx and would like to open it directly, probably as a BytesIO. I've spent some time with the pywin32 docs, and the generated source code Documents.py is no help to me.

Here's an example of what currently works:

import win32com.client as win32
from docx import Document

doc = Document()
doc.save(path_to_file)

word = win32.gencache.EnsureDispatch('Word.Application')
word.Documents.Open(path_to_file)


And here is the pattern I would prefer to use:

import win32com.client as win32
from docx import Document
import io

doc = Document()
docstream = io.BytesIO()
doc.save(docstream)

word = win32.gencache.EnsureDispatch('Word.Application')
word.Documents.Open(docstream)


However, this results in an error: pywintypes.com_error: (-2147352571, 'Type mismatch.', None, 16)

How can I get a bytestream into word.Documents?

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