> That means they're not using it since they don't have to deal with spaces as spaces vs as separators The end-user isn't consciously using it. The software th

> That means they're not using it since they don't have to deal with spaces as spaces vs as separators The end-user isn't consciously using it. The software they are using is. We are talking here about programmer-visible reality, not end-user-visible reality. Those two realities don't have to be the same, as in the "replace spaces with underscores and vice versa" idea. > So how do you differentiate between a user inserting a space and a user inserting a literal _ in a file name? Underscores are rarely used by non-technical users. It isn't a standard punctuation mark. Back when people used typewriters, the average person was familiar with using them to underline things, but nowadays, the majority of the population are too young to have ever used one. I doubt many non-technical users would even notice if underscores in file names were (from their perspective) automatically converted to spaces, since they probably wouldn't put one in to begin with.