Open file in neovim from terminal in same editor. Simple. Windows compatible.

.bashrc

alias e="remote.neovim.py"

remote.neovim.py

#!c:/Python38/python.exe
#
# Hacky, but it works on Windows
#

import os
import neovim
import argparse

def isAbsolutePath(path):
    return args.file.find('/') == 0

nvim = neovim.attach('socket', path=os.getenv('NVIM_LISTEN_ADDRESS'))

parser = argparse.ArgumentParser()
parser.add_argument('file', help='File to open in the existing neovim session')

args = parser.parse_args()

if isAbsolutePath(args.file):
    nvim.command(f':tabnew {args.file}')
else:                           # relative path
    nvim.command(f':tabnew {os.getcwd()}\\{args.file}')

This is used in the bash that comes with git on windows. It's a little hacky (leaves an error on stderr after each run) but it works.