info.txt file was used with Alexa (Alexa.com) to help update/verify your website. Alexa.com has since changed how they update the websites, so the info.txt file is no longer needed. If you want to update/add your listing, all you have to do is
info.txt file really needed? Best thing to do is check your listing in Alexa.com. You can opt to submit changes via their site, or you can upload your info.txt file. It’s not a must have for your website, but it would be good to make sure that your listing info is correct. Also, they use the NoFollow tag when linking to your website, so no link juice will pass on.
If you did have your listing verified before with the
info.txt file,with Alexa you may need to add your website to your profile again for making changes, but it should still have your old info from the info.txt file.