Files with non-ASCII characters in their names attached to the submitted assignments are not accessible to the instructor.
However, these files can be found in Sakai storage directory on the server. For example, attempt to download the file called (in Russian) "1 ???????????? ??????.rar" causes Tomcat to report that the resource "https://domain.com/access/content/attachment/8b514ee8-e3f4-425f-8042-20b32a8d3e34/Assignments/e89b103d-1e20-46c6-9bd1-3a4aff9010ca/1%20%D0%BB%D0%B0%D0%B1%D0%BE%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%BD%D0%B0%D1%8F%20%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0.rar " is not available. This file was found on the server as E:\Sakai\2008\273\21\08e2e217-3d88-4cbd-85ac-c624b267b972