IIS 7.5 FTP temporary files

I've a problem when uploading files to an IIS 7.5 FTP site in the same ftp session. If the file transfer gets interrupted, a new transfer is initiated, but it seems as the new file get a temporary name based on the session id and a tmp extension

{8CFF1C1E-C38D-22E2-9578-005056BD0664}.tmp

Where does IIS set the name and should the FTP service not automatically overwrite the old interrupted transfer with this new temporary file once the transfer is completed?

For now I have to check the ftp log for matching the temporary file with the original file name.

In Advanced settings I have the following settings

Allow reading files while uploading = false
Allow replace on rename = true 
Keep partial uploads = true

What I want to do is to have the temporary files replace the old interrupted files or change the way IIS names the temporary files.

Is there a way to configure IIS FTP temporary files naming?