File Extension CRDOWNLOAD
File extension CRDOWNLOAD is used by Google Chrome browser to store partially downloaded files. When file is being downloaded by Google Chrome it is always assigned with CRDOWNLOAD file extension. When download process is complete file extension CRDOWNLOAD is changed to the extension corresponding to data in the file.
There is no easy advice for how to open CRDOWNLOAD files - since it can contain any information which is downloaded from internet. If you have some computer knowledge you may want to use text or hex editor and try to guess what kind of information is stored in the file. For example if CRDOWNLOAD file contents starts with ZIP... you can assume that it is a ZIP archive, rename it and try to open it with unarchiver.