Filenames of web pages should only use ASCII lowercase letters and the underscore
character. This is not a KSW requirement (KSW can take any topic filenames), but a
recommendation for web compatibility. Using non-ASCII filenames works too (mostly), but
for legacy reasons ASCII is safer on the web for filenames.
When sorting filename lists, KSW
uses the (language invariant) sorting algorithm. See
Language Invariant.
See also
Invalid Filenames.