Issue with os.rename

[malinowy]

This is *.msg file - email saved from Outlook.
I closed Outlook, closed Total Commander but still getting the issue :(

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I am using this to get some information from email body

import extract_msg

msg = extract_msg.Message(ff)
msg_message = msg.body
p_id = msg_message[msg_message.find(start_text)+len(start_text):msg_message.find(end_text)]

Maybe this code is holding the file open?

Any ideas?