I wrote code in 1993 to deal with this in a DOS-based document-management system, PC DOCS. If users of the system created files with these names, it had to chan

I wrote code in 1993 to deal with this in a DOS-based document-management system, PC DOCS. If users of the system created files with these names, it had to change them to some tokenised version that would then magically re-appear as the original name when requested. I don't remember the exact algorithm, but I remember it was a lot more complicated than I thought it would be when I got the assignment.