move (.eml) files to Inbox

I have email files stored on a users hard drive. The files are like test.eml, test2.eml and so on. What I want to be able to do is move the .eml file from their hard drive to their Inbox in outlook. Does anyone know how to do this?

I know people are going to ask why I need to do this but it is just the way the customer has things setup.

thanks