The Security Mentor

Of course, you should always be careful about files you're not expecting. But right now there's a chance of malicious software hiding in Microsoft Access database files, which have the extension ".MDB".

I don't think this will be a huge problem. For one thing, people don't normally pass around databases like they do pictures. For another, Microsoft already knows about the problem and is presumably working on a fix. Best of all, I haven't heard of any real-world attacks yet. Unfortunately this could change tomorrow since someone has published an example attack program.

Up to date antivirus might protect you. Install Microsoft's fix as soon as it comes out, and in the meantime don't take candy from strangers.