With the CRDOWNLOAD file extension, the web browser marks Google Chrome files during the download. These files record the contents of a file being downloaded. When the download is done, the extension will automatically be removed from Chrome.
The extension is only appended to the original ending of the download file, for example, Clip.avi.crdownload. This procedure is intended to prevent users from opening unfinished files. For streamable material, of course, the extension can be easily removed manually and so the content can be used.
If a download is aborted by the user, Chrome deletes these files automatically, only in case of a Windows or browser crash such files remain. Unfortunately there is no possibility with Chrome to continue the download of a CRDOWNLOAD file later.
Unfortunately a bit tricky, but with the program wget CRDOWNLOAD files can be continued. After removing the extension CRDOWNLOAD you can use the --continue switch (which is an option of wget) and specifying the source of the file to get it ready to load.