VBA Programming

This one is for PowerPoint specifically, and hopefully any other MSOffice app. I want a macro to fire up when a document (powerpoint) is opened to make sure that the file being opened is the latest version of the file on our network. Is there an event that can be called to execute when a file is opened? More specifically, I am doing this through OLE automation and want to know if, when I call a file to be opened through OLE, the macro will fire when it is opened?

Thanks

George