>Nice, thanks a lot. It now returns 6 - The handle is invalid...
>
>:)
>
>So, the evolution is: 1223->127->6

MSDN entry for SHFileOperation Function doesn't say that GETLASTERROR() can be used after it. It's possible that the error returned by GETLASTERROR() isn't from SHFileOperation.

>And here is a test program to produce an error (if you remove \*.* in dest. string, the copy command works fine

You cannot use wildcard characters in the destination string. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/shell/reference/structures/shfileopstruct.asp