Duplicate file name in the release are not allowed on the osdn file release system.
When you want to re-upload the file in the release, you should remove the old one then upload the new one.
A result of the above constraints, there are some problems such that "The operation is stressful when you want to replace a large number of files", "These files on the file list will be missing between the old files are removed and new files are finised to upload."
To solve this problem, we add file orverwrite option for file release.