Database.dat file's appearance on the system means that your computer is infected with AXPDefender. It is a dangerous application, which acts as a scareware. In addition to this, it has also been noticed for its rootkit capabilities that help this virus hide deep inside the system. Once it infects computer and hijacks the system, AXPDefender starts displaying misleading alerts about invented viruses. Of course, it does that for making its victims believe that they should purchase its licensed version. Please, don't spend your money on such fakes! This can not only lead you to the money loss but can also help scammers reveal your bank loggins and other sensitive information.
As soon as AXPDefender creates the database.dat file, it starts using it according to its needs. This virus can use this file for infecting system with its dangerous components, updating itself, corrupting installed software and violating your privacy by recording your keyboard clicks. That's why you should NEVER leave this file running in your system's background!
NOTE! Sometimes the presence of Database.dat file doesn't mean that computer is infected. It may also be used by legitimate programs as well. That's why we highly recommend examine database.dat before terminating this process. For that you can use RegCure Pro.