It's actualy simpler with WIn API. See Re: How to receive progress update during COPY FILE TO ? Message #793756.

>I have to copy large files via network. It can take time. In order to give the user more control over the copying i intend to write a copy procedure based on Fread()/Fwrite(). I've tryed a sceleton version of it on a 144mb file - no problem.
>Don't want to use window's API function for it takes a structure so ClsHeap is needed and it becomes complicated. If you have no objections to Fread()/Fwrite() i'll give it a go.