A .dropbox file is automatically created by the Dropbox client software. This is a program for uploading and downloading files to and from your computer and the Dropbox cloud storage service. These DROPBOX files contain data that's used by the Dropbox client software for synchronizing files stored in your local machine with the Dropbox cloud storage service, and this effectively speeds up data transfers.A .dropbox file also contains data that's used by the Dropbox client program to transfer files to and from your computer and the Dropbox cloud storage service. These data transmissions are performed by these programs through Internet file transfer protocols. This also means a .dropbox file may contain data that's used to encrypt these data transmissions.DROPBOX files aren't meant to be opened. These do not contain any useful data. It's best to leave these DROPBOX files as they are, in order for the Dropbox client program and the Dropbox cloud service to function properly.
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