Next to try the same thing with the Advanced Level 4 file server. This is supposed to support 32-bit file lengths. However, this involves the use of different file server operation codes, which aren't supported by 8-bit ANFS, or even by RISC OS's usual version of the NetFS module. An updated NetFS is required. Let's see what happens with Advanced L4FS, version 2.10, on the Master.