001.dat is a dangerous file, which belongs to MalwareDestructor. No matter that this program looks like a harmless security application, all what it does is making people look at misleading pop-up ads that report about invented viruses. Once it trick people into believing that their PCs are infected, it offers to pay for their removal. Don't even think about purchasing MalwareDestructor! It's a useless program, which is used for stealing people's money. For eliminating it from the system, you should rely on reputable anti-spyware.
001.dat is created as soon as MalwareDestructor infects computer. Once this file is created, it is mostly used for dangerous activities. It can be set to modify system's settings, display annoying pop-up ads or even record keyboard clicks and collect private user's information in this way. Basically, 001.dat works according to the type of virus.
NOTE! Sometimes the appearance of 001.dat does not mean that your system is infected. The file may actually belong to a fully legitimate application. That's why you should always check the trustworthiness of this file before eliminating it from the system. For that we recommend using RegCure Pro.