Am Sat, 29 Jul 2023 12:12:12 +0200 schrieb LARONDE Thierry: > OK, let's go to "TeX: The Program": m.537 (p 214): Your concrete problem is not the implementation of \input, your problem is that your implementation of \pdffilesize (which by the way is not mentioned in "TeX: The Program") doesn't use the same method to find a file as your \input/\openin. It is -- as David already wrote -- quite a problem if "\pdffilesize filename" reports a size that differs from the size of the file that is input with "\input filename". It doesn't make much sense therefore to muse on if or if not the current engines implement exactly what "TeX: The Program" says. Simply get \pdffilesize etc in sync with \input, \openin etc. -- Ulrike Fischer http://www.troubleshooting-tex.de/