When an FTP user uploads a file to FTP to an empty directory, then
renames/moves the file to another folder where the samely named file exists
and even being served by Apache, it simply works! How does this work? I do
not think in Windows you can overwrite an file that is being read. Could
somebody let me know please?


Sure you can :-)
An open file can be renamed without affecting the program(s) having the file already opened: any file handle still refer to the opened file. Then once renamed, you can write an new file with the old name.

I use this trick to have a exe updating itself while executing.

--
francois.pie...@overbyte.be
The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be


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