what?

Return of the Obra Dinn saves your game as .txt files
containing XML
which contain a date and a <data> element that's a base64 encoded string.

that sounds like binary with extra steps
@foone binary you can copy paste?
@agatha @foone binary you can transfer over connections that can only do text unless properly configured

like ftp used to love to just make everything a text file unless you set it to binary mode.
@agatha @foone and on windows particularly, if you open a file not explicitly as a binary file, any 0x0A (line feed in ASCII) would become 0x0D 0x0A because windows converts normal line feeds