No, I think those are the Windows people who put / in the file names, because back then Windows wasn’t really restrictive about stupid file names. At least I think it isn’t possible anymore, but can’t confirm, because I don’t use Windows for around 15 years.
The long filename system allows a maximum length of 255 UCS-2 characters including sources and non-alphanumeric characters (excluding the following characters, which have special meaning with the COMMAND.COM command interpreter of the operating system kernel: \ / : * ? " < > |).
No, I think those are the Windows people who put / in the file names, because back then Windows wasn’t really restrictive about stupid file names. At least I think it isn’t possible anymore, but can’t confirm, because I don’t use Windows for around 15 years.
Long filename (LFN) Limits
Edit: reformatted