Upload alias file

Summary: What format does the alias file need to be?

Content (required): Hello. I'm wondering what is the best practice for downloading the alias.txt file, modifying it with a large amount of data, then uploading it back into the console? The reason I ask is because downloading a copy of the alias.txt file and viewing it in notepad seems to remove the carriage returns which seem to be essential for it to function. If I wanted to modify the file locally and upload it, does it make sense to open it in Excel as a CSV first? Hopefully someone has experienced this before.