(ChRomeDOWNLOAD) The extension assigned to a file by the Chrome browser while it is being downloaded into the computer. Users may never see this extension if the file is small, but if it is large, the filename.crdownload will be visible in the downloads folder. When the file has been completely transferred, it is renamed back to the original file extension. Download managers and other Web browsers assign extensions such as .download and .partial. See Chrome browser.