Files with the .download file extension normally contain files that are being downloaded by the Google Chrome Web browser. If you begin to download a file using the Chrome Download Manager and the file download does not download completely, the file will be given the .download file extension until the download can resume. When the download resumes and finishes, the Chrome Download Manager will rename the file with the proper file extension.
Other download utilities and P2P file-sharing programs have also been known to use the .download file extension for partially-downloaded Internet files. In all cases, the files are renamed with the proper file extension once the file has finished downloading to the user's computer.
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