https://www.w3.org/TR/2021/WD-epub-33-20210224/#sec-container-filenames
If you exclude "Non characters in Arabic Presentation Forms-A (U+FD00 ... U+FDEF)", then you ought exclude all non characters. http://www.unicode.org/faq/private_use.html#nonchar4
https://www.w3.org/TR/2021/WD-epub-33-20210224/#sec-container-filenames
If you exclude "Non characters in Arabic Presentation Forms-A (U+FD00 ... U+FDEF)", then you ought exclude all non characters. http://www.unicode.org/faq/private_use.html#nonchar4