It likely contains 100,000 lines of data formatted as email:password or just a raw list of email addresses.
A file named 100k mailist orange et wanadoo.txt is almost certainly a or a marketing scrape .
Because millions of people had @wanadoo.fr or @wanadoo.co.uk addresses, Orange continued to support these legacy domains for years, making them prime targets for long-term data collection. 📂 Anatomy of the ".txt" File
Launched in 1996 by France Télécom, it was the dominant Internet Service Provider (ISP) in France and the UK for a decade.