Remove selected file(s) before upload with Javascript

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FileList has no API to remove entries:

https://developer.mozilla.org/en/DOM/FileList

However you can reconstruct File uploader using XHR2 and AJAX and filter in content there.
This implies doing XHR2 and AJAX upload and is not suitable for traditional <form> uploads.

https://developer.mozilla.org/en/Using_files_from_web_applications

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