>>No. If you have overwrite 'true' then the fact that the destination already exists should not be a factor. See the code Gregory posted - an exception can be thrown if permissions fail.
>
>I have overwrite there but the directory is always empty when I start my copy. So, the overwrite flag is not a factor here. The initial transaction is the copy. While it is in progress, the other program succeeds to take a hook to start copying that file somewhere else but the copy I am doing is not finished yet. This is what I am wondering if the CopyFile() is really locking the file or while the copy is in progress, anyone can get a hold of it.

To be clear : Can you confirm that it is the CopyFile() that is throwing the exception - not the second program that attempts to access the file.....

>IAC, I have adjusted to copy the file as lcFile+".TMP" and then I rename it to lcFile.
>
>>What's the errorCode in WinIOError() ?

Should be in the exception stack ?