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Before every download, this app will check to see if the file already exists in your Downloads folder. If it does, you will be asked whether you'd like to open the existing file, or download the new one. In order to use this app, select it as the default during the "Complete action using" dialog. You have the option of checking using either MD5 or file name.
For HTC Sense, the option will be "Play online" during the "Download file" dialog.