Allow everyone write access through python

So, let's start with the base problem;

Program writes a file as user of elevated rights.

Later: Same program tries to overwrite the file without elevated rights.

In Windows this clashes with:

PermissionError: [Errno 13] Permission denied: 'filepath'

I need this to work on Linux/Windows/Mac, though it seems like windows is the only one exhibiting this issue currently, so I tried to fix it with windows methods on windows. CHMOD doesn't work under windows anyway.
So, the problem is, that the file is owned by Administrator or another user with extended rights when the program is run as that user. If I can just create the file with "everybody write" permission, then this would not be a problem.
I found no portable way to do so in pure python. I can only remove the read-only flag but it doesn't solve the ownership issue.

So I tried win32security However, the call to LookupAccountName is locale dependent:

>>> win32security.LookupAccountName(None, "Everyone")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
pywintypes.error: (1332, 'LookupAccountName', 'Zuordnungen von Kontennamen und Sicherheitskennungen wurden nicht durchgeführt.')
>>> win32security.LookupAccountName(None, "Jeder")
(<PySID object at 0x00000184AA586560>, '', 5)

And therefore not portable. I also found no way of manually creating the "Everyone" SID, the docs are rather minimal in that respect. But I might also be following the wrong rabbit hole.

Edit: If it matters, in this particular case at least, all relevant files are under "%programdata%/programname/*" in windows.

Solution

This problem went away with one of the windows updates within the 1903 timeframe. Some additional digging seems to suggest this was a bug in windows IF that system is part of a domain and ownership would fall into a domain user.