That is a character special file. By convention, it should be in /dev. When you copy from it, you are trying to read from a device driver. A file system object like that is created with the mknod command, although HP-UX provides insf and mksf which really need to be used except in certain special cases. The 64 is the major number and this id's which driver you are trying to use. The HP-UX command lsdev will list all drivers with thier special numbers. lssf might also be able to tell you about it if it is valid. Be careful with special files. If you write to one, you could scribble on a disk.