In filenames? AMATEURS! Use obscure Unicode in your passphrases for maximum security. Ctrl-Shift-U, enter arbitrary code point, bam! 🦊 Works even better with a Compose key and a nice, chonky .XCompose file to throw some gr∑∑k letters around, for instance, like some confused script kiddie. :)

On topic: There are multiple variants of spaces in Unicode. You're welcome, and now go and create something utterly deranged with that information.