Microsoft no longer distributes single TXT recovery codes. Instead, they use the Authenticator app. However, if you have an old 2021 TXT file with a "Single-use code," it will work only if you haven't reset 2FA since.

Plain text (.txt) files are the universal format for exporting email data without proprietary formatting. In 2021 and 2022, all three services allowed users to export:

However, none of these providers ever released a legitimate "master TXT file" containing actual email content in plain text for security reasons. If you downloaded a file named yahoomail_2022.txt from a third-party site, it is likely a scam or a collection of public email addresses harvested before 2021.

The file appears to be a plain text list of email addresses or domains from three major providers:

Dates suggest the data was collected or last updated in 2021–2022.