Thanks darklight_tr. I can now confirm that it works as expected. :Thmbsup:
There's one thing that confused me at first. The choice of the phrase "source folder" is a bit misleading - it's really the root destination folder, and nothing to do with the source of the file being copied. Perhaps this could be modified in your new GUI version.
I am having trouble with v3.1.0. The source file isn't propagated - when I look at the replace.txt file it's contents say "No file replaced". Trying the replace command from a command window worked ok. I do have spaces in the folder names, but this version is supposed to be ok with that. I am using Win XP SP2.