hy! I was unable to copy a file at 5.270.075.494 bytes size with winscp. Both source and target disk have free space over 10Gigabytes, I used version 3.7.3. Both filesystems, NTFS and the other side is Reiser4, supports big files. It seems that the error allways appears. It seems that it stops at a 32bit unsigned int boundary (4294967295), at least it is very close to it... Please fix it by using a bigger data type. thx.